[a로 시작하는 명사 영영풀이]
ache
noun : a dull pain that lasts for a while
action
noun : the doing of something; the events that make up a story
actor
noun : a person whose profession is to act in movies, on stage, or on television
ad
noun : an advertisement; a public notice about a product or service for sale
address
noun : the details about the location of a place
afternoon
noun : the time of day between noon and evening
age
noun : the time a person or thing has lived
air
noun : the invisible mixture of gases around Earth that many living things need to live
aircraft
noun : an airplane or other vehicle that flies
airplane
noun : a machine with wings that flies
airport
noun : a place where airplanes and other aircraft take off and land
alarm
noun : a device that uses a bell, siren, or other loud noise as a warning or signal
animal
noun : a living thing that can move from place to place and that eats plants, other animals, or both
ant
noun : a small insect that lives in a colony
ape
noun : a furry animal, such as a chimpanzee or gorilla, that is closely related to monkeys or humans
apple
noun : a firm fruit that grows on a tree and has red, yellow, or green skin and seeds inside
April
noun : the fourth month of the year
arm
noun : a limb attached to the shoulder
arms
noun : limbs attached to the shoulders of a human or other animal; limbs of some animals, such as sea stars
art
noun : something made in a creative way to be beautiful or to show a feeling or idea
art
noun : works made by painters, writers, musicians, sculptors, film directors, and other artists
artist
noun : a person who is good at painting, music, writing, or another art or craft
August
noun : the eighth month of the year
aunt
noun : the sister of your parent or the wife of your uncle
auto
noun : a short form of the word "automobile"
autumn
noun : the season after summer and before winter
award
noun : a certificate or prize that honors an achievement
ax
noun : a tool often used to chop wood
axe
noun : a tool often used to chop wood
abalone
noun : an edible shellfish that has a flat shell lined with mother-of-pearl
abbot
noun : the leader of a group of monks
abbreviation
noun : a shortened form of a word or phrase
abdomen
noun : the back part of an insect's body, which contains the reproductive and digestive organs
abdomen
noun : the part of the body between the chest and the hips, where most of the digestive organs are located
Abilene
noun : a city in north-central Texas
ability
noun : a skill or talent; the power to do something
abolition
noun : the act of doing away with or ending something; the act of making slavery illegal
abolitionist
noun : a person who fought to make slavery illegal
Abraham Lincoln
noun : sixteenth U.S. president; wrote the Gettysburg Address (1809-1865)
abrasion
noun : an area on the skin that has been damaged by scraping or rubbing
abuela
noun : the Spanish word for "grandmother"
abundance
noun : an amount that is more than enough
abuse
noun : physical or psychological mistreatment of a living thing
academy
noun : a place where people study and learn about a special field; an organization of experts in a field
accelerant
noun : a substance that makes a fire grow faster
acceleration
noun : an increase in the speed or direction of a moving object; a vector measurement that involves direction
accent
noun : an extra emphasis on a sound or word when speaking
acceptance
noun : the act of agreeing to receive or begin something offered; the act of being received as suitable
access
noun : a way of getting near to or entering something or someplace; a way of being able to use or get something
accessory
noun : something added to another thing to make it more attractive or useful
accident
noun : an event that was not planned
accolade
noun : a sign of recognition or approval
accompaniment
noun : a musical part that supports or enriches a more important part
accompanist
noun : a person who plays music to support a main instrument or a singer
accomplishment
noun : the successful completion or fulfillment of a task
accordion
noun : a portable musical instrument with keys or buttons and hand-operated bellows
account
noun : an arrangement with a bank in which customers keep their money in the bank in exchange for certain services
account
noun : a description or report of an experience or event
accountant
noun : a person who maintains or inspects financial accounts
accumulation
noun : a piling up of material over time
accuracy
noun : the state or quality of being precise, correct, or exact
ace
noun : an expert
ace
noun : a fighter pilot who has brought down five or more enemy planes
achievement
noun : an accomplishment reached as a result of effort
acid
noun : a chemical compound that reacts with a base to form a salt, tastes sour, and has a pH value below 7
acknowledgment
noun : a section of a book that contains appreciation from the author to those who helped with the book
acne
noun : a skin condition caused by inflammation of the oil glands, resulting in pimples usually on the face
acorn
noun : the nut of an oak tree
acquaintance
noun : knowledge of someone or something; a person you know who is not a close friend
acre
noun : standard measure of land area equal to 4,840 square yards; an area slightly smaller than an American football field
acrobat
noun : a person who performs tumbling or other physical tricks, sometimes on a trapeze or a tightrope
acronym
noun : a word formed from the initials of a set of words
act
noun : a part or section of a play that is usually made up of scenes
activist
noun : a person who works to bring about social or political change
activity
noun : the quality of being active
acupuncture
noun : a treatment in which tiny needles are temporarily inserted into the skin at specific locations on the body to relieve pain
adaptation
noun : a change in an organism or species that allows it to survive better in its environment
addend
noun : a number that is to be added to another number
addiction
noun : the state of being addicted, or dependent, on something
addition
noun : the process of combining numbers into one sum
address
noun : a formal speech
adjective
noun : a word used to describe a noun
adjustment
noun : the act of changing something so it fits, works, or looks better; a time of getting used to a new situation
administration
noun : management
admission
noun : the cost of a ticket; the ability to get in a place, club, or school
adobe
noun : a mixture of sandy clay and straw that is dried into bricks
adolescent
noun : a person who is between childhood and adulthood
Adolph Hitler
noun : political leader; World War II figure (1889-1945)
adornment
noun : something that makes a person or thing more beautiful
adrenaline
noun : a hormone made by the body that increases heart rate and energy in response to a strong emotion such as fear, anger, or excitement
adult
noun : a fully grown person or other animal
adult
noun : the stage in which a person or other animal is fully developed
advantage
noun : a positive situation or feature, often one that puts a person in a favorable position
adventure
noun : an unusual or exciting experience
adverb
noun : a word that describes a verb
adversary
noun : an enemy or opponent
advertisement
noun : a public announcement about a product, service, or cause
advertising
noun : the promotion of products, services, or events to attract interest and promote sales
advice
noun : suggestions about a decision or action
adviser
noun : a person who offers advice
advocate
noun : a person who actively supports a cause
aerobics
noun : exercises that increases respiration and heart rate
aeronautics
noun : the work or study of flight
affair
noun : a special event or series of events
affection
noun : a warm liking; a loving feeling
affix
noun : an element that is added to a root word to form a new meaning
Afghanistan
noun : a landlocked country in south central Asia
Africa
noun : the second-largest continent in the world, located south of Europe
afterlife
noun : life after death; life after the physical body dies
aftershock
noun : a small earthquake that occurs during the days or months after a larger earthquake has occurred
agenda
noun : a list of things to do or talk about
agent
noun : a person whose job is to provide a special service to customers
agent
noun : a person, such as a spy, guard, or investigator, who has been given the authority to act on behalf of a government
agility
noun : the ability to move quickly and easily
agitation
noun : a state of excitement, worry, or disturbance
agony
noun : extreme and intense pain of the mind or body
agreement
noun : the sharing of an opinion with another person
agreement
noun : a promise between two or more people or groups
agriculture
noun : the science or practice of farming and raising livestock
aide
noun : an assistant to an important person
air conditioner
noun : a machine that cools the air inside a building
air force
noun : the airborne part of a country's armed forces
air pockets
noun : areas of air surrounded by matter
air pollution
noun : the presence of toxic substances in the air we breathe
air quality
noun : the measure of how clean or polluted the air is
airfield
noun : an area of land where airplanes take off and land
airline
noun : a company that offers regular air transportation
airman
noun : a person who pilots an airplane
airship
noun : any self-propelled lighter-than-air aircraft that has the means to control its direction of flight
airstrip
noun : a narrow strip of land used for aircraft to land and take off from
aisle
noun : a walkway between seats, sections, or shelves
Alabama
noun : a U.S. state in the Southeast between Georgia and Mississippi (capital: Montgomery)
Alamo
noun : a former fort in Texas that was the site of a famous 1836 battle
Alaska
noun : the forty-ninth U.S. state, located in the extreme northwest corner of North America (capital: Juneau)
Albany
noun : the capital of New York, located in the eastern part of the state
Albert Einstein
noun : physicist; developed the theory of relativity (1879-1955)
Alberta
noun : a western Canadian province bounded on its west side by the Rocky Mountains
album
noun : a blank book for keeping photographs, stamps, or other flat souvenirs
Alcatraz
noun : a small, rocky island in San Francisco Bay that used to be the site of a federal prison
alcohol
noun : a beverage, such as beer, wine, or whiskey, which contains an ingredient that can cause a person to lose control of behavior
alevin
noun : a newly hatched salmon or trout that still has a yolk sac
Alexander Graham Bell
noun : inventor of the telephone, wax records, and the fast hydrofoil (1847-1922)
alfalfa
noun : a plant in the pea family that is commonly made into hay to feed livestock
algae
noun : a simple type of plant that does not have roots, leaves, stems, or flowers
algebra
noun : a branch of math in which symbols, usually letters, are used to represent unknown numbers
alias
noun : a name used instead of one's real name
alibi
noun : an excuse that proves a person could not have committed a crime
alien
noun : a being from a place other than Earth; an outsider
allegiance
noun : loyalty; dedication to a person or a group
allergy
noun : a medical condition that causes a person to have a bad reaction to a normally harmless substance
alley
noun : a narrow passageway behind or between buildings
alliance
noun : a close association between countries or other groups who work together
alligator
noun : a large reptile similar to a crocodile but with a shorter, broader head
allowance
noun : a sum of money given out on a regular basis
ally
noun : a person or group that joins with others for a common cause
almanac
noun : a publication that contains information about weather, astronomy, tide tables, and more for a calendar year
almond
noun : an edible seed from a tree that comes from the Middle East
alpaca
noun : a long-haired South American mammal that is a relative of a llama
alpha
noun : the first letter of the Greek alphabet; Α or α
alphabet
noun : the letters of a written language
alphabetical order
noun : the order of the letters in the alphabet
alpine skiing
noun : the sport of downhill skiing
altar
noun : a table or other raised surface that is used for religious or spiritual purposes
alternative
noun : a choice or possibility
altitude
noun : height above a surface
alto
noun : a singing voice or an instrument having a key range above tenor
aluminum
noun : a light silver metal
amateur
noun : a person who does an activity for fun or as a hobby instead of as a professional
amazement
noun : a feeling of wonder or great surprise
ambassador
noun : a representative of a country, species, or cause
ambition
noun : a person's dream or objective
ambulance
noun : an emergency vehicle used to take sick or hurt people to the hospital
ambush
noun : a surprise attack conducted from a hidden position
Amelia Earhart
noun : pioneering female pilot who disappeared in the South Pacific (1897-1937)
amendment
noun : a change or addition to a document or law
amends
noun : acts that are intended to improve a bad situation
America
noun : another name for North America, North and South America, or the United States
American Indian
noun : a person whose ancestors lived in the Americas before Europeans arrived
Americas
noun : the western hemisphere's entire landmass; North and South America combined
amiga
noun : the Spanish word for "female friend"; a female one likes and trusts
amigo
noun : the Spanish word for “friend”; a person one likes and trusts
ammunition
noun : anything fired from a gun, such as bullets, missiles, or cannonballs
amount
noun : a number or quantity of things
amphibian
noun : a cold-blooded animal with a backbone that generally spends some time in water and some time on land
amplifier
noun : a piece of electronic equipment that makes sounds louder
amulet
noun : a charm worn on the body for protection against injury or evil
analogy
noun : the comparison of two things not normally thought of as alike
analysis
noun : the close examination of something to learn more about it
anatomy
noun : a branch of science that studies the physical structure of living things; the parts that make up the physical structure of a living thing
ancestor
noun : a family member from long ago
anchor
noun : a heavy object that is attached to a rope or chain and dropped into the water to keep a boat or ship from moving
Anchorage
noun : the largest city in Alaska, located in the south-central part of the state
anchorman
noun : the crew member on a ship who operates the anchor
Andrew Jackson
noun : seventh U.S. president (1767-1845)
Andrew Johnson
noun : seventeenth U.S. president (1808-1875)
anemia
noun : a blood condition in which there are too few red blood cells, resulting in poor health
anemone
noun : a plantlike, marine invertebrate whose tentacles often look like flower petals
angel
noun : a spiritual being believed to be a divine helper; a person who is outstanding in some way; a person who is very helpful to others
anger
noun : a strong feeling that may range from annoyance to rage
angle
noun : a certain way of thinking about an issue or problem
angle
noun : a figure formed by two lines that meet at a point
animation
noun : a movie made from photographing objects or drawings in a series of different positions
ankle
noun : the joint between the leg and foot
anniversary
noun : the date each year on which an event happened in a past year
announcement
noun : a written or spoken statement made to a group
annoyance
noun : the state or feeling of being irritated; a situation that causes irritation
annual
noun : a plant that grows, flowers, makes seeds and dies in one year
answer
noun : information said or written in response to a question
antagonist
noun : one who goes against another in a battle, contest, controversy, or debate; a rival
Antarctica
noun : an ice-covered continent near the South Pole
anteater
noun : a toothless mammal that eats ants and termites
antelope
noun : any of a group of fast-running, deerlike animals that are related to cattle, bison, sheep, and goats
antenna
noun : a wire used to send and receive radio or TV signals
antennae
noun : the thin feelers found on the heads of some animals that help them touch and smell
anthem
noun : a song of national pride
anther
noun : the male part of a flower that produces pollen
anthropoid
noun : a primate that is a monkey, ape, or human
anthropologist
noun : a person who studies human societies around the world
antibiotic
noun : a medicine made from organisms that fights infections in the body
anticipation
noun : the feeling of expecting something to happen
antics
noun : playful, silly, outrageous, or foolish behavior
antidote
noun : a medicine that stops the effects of a particular poison
antifreeze
noun : something added to lower the freezing point of a substance
antique
noun : an object or piece of art or furniture that is old and valuable
antivenin
noun : a kind of medicine used to stop the damage from a venom; antivenom
antivenom
noun : a kind of medicine used to stop the damage from a venom
antlers
noun : hornlike growths on mammals, such as moose, caribou, and deer, that are made of bone and are grown and shed each year
antonym
noun : a word that has the opposite meaning of another word
apartment
noun : a building that has many units in which people live
apartment
noun : a room or rooms in a building that people rent and use as a place to live
apology
noun : an expression of regret for a mistake or an action that hurts someone
apostrophe
noun : a punctuation mark (') used to show possession or to show where one or more letters have been left out
Appalachians
noun : a long mountain chain in the eastern United States and eastern Canada
appeal
noun : a formal request in a court for a legal decision to be changed
appearance
noun : the way a person or thing looks
appeasement
noun : pacifying a hostile enemy to avoid intensifying a conflict
appendage
noun : an external body part that sticks out from the body, such as an arm or a leg
appendix
noun : a collection of extra information at the end of a book or report
appetite
noun : the need or desire for food
applause
noun : approval shown by the clapping of hands
applesauce
noun : a sauce made from cooked and mashed apples, often sweetened and spiced
appliance
noun : a mechanical or powered household device
application
noun : a software program with specific instructions and a specific purpose
application
noun : a written form used to apply for a job
appointment
noun : an arrangement to meet at a certain time
appreciation
noun : gratitude; the enjoyment of a person's or thing's good qualities
apprehension
noun : a feeling of fear or worry that something bad is going to happen
apprentice
noun : a person who learns a skill or trade from a skilled professional
approach
noun : a way of doing, thinking, or dealing with something
apricot
noun : an orange-yellow fruit with a pit that resembles a small peach
apron
noun : a piece of clothing worn for protection over regular clothes and tied at the back
aquaculture
noun : the growing and harvesting of aquatic plants and animals
aquarium
noun : a tank that holds water animals and plants; also, a building that is like a zoo for marine animals
aquatics
noun : sports performed in or on the water
aqueduct
noun : an artificial channel that carries water from one place to another
arbor
noun : a shelter made of branches or vines
arc
noun : a section of a circle or other curved shape
arcade
noun : an indoor area containing video games, pinball machines, and other similar games
arch
noun : a skydiving position in which a person falls stomach-down with the hips thrust forward
arch
noun : the curved middle part on the inner side of a foot
archaeologist
noun : a scientist who studies the remains of ancient cultures
archaeology
noun : the study of the remains of ancient humans, such as ruins or pottery
archer
noun : a person who is skilled at shooting with a bow and arrow
archery
noun : the skill or sport of shooting with a bow and arrows
architect
noun : a person who designs buildings
architecture
noun : the design and construction of buildings
Arctic
noun : the area around the North Pole, including the Arctic Ocean
Arctic Ocean
noun : the ocean north of Asia, Europe, and North America that contains the North Pole
area
noun : a region, piece of land, or part of a building, often used for a special purpose
area
noun : the measurement of space inside a shape, surface, or region
area code
noun : a three-digit prefix to a phone number used to dial a specific geographic region in the United States, Canada, or certain other countries
arena
noun : a flat area surrounded by seats where spectators watch a sporting or entertainment event
Aretha Franklin
noun : singer (1942-present)
Argentina
noun : the second-largest country in South America
aristocrat
noun : a member of the ruling or wealthy class
arithmetic
noun : the branch of mathematics that deals with addition, subtraction, multiplication, and division
Arizona
noun : a U.S. state in the Southwest between California and New Mexico (capital: Phoenix)
ark
noun : a large flat-bottomed boat; the ship from the Bible that was built by Noah to save his family and pairs of animals from a flood
Arkansas
noun : a U.S. state in the South, just north of Louisiana (capital: Little Rock)
armadillo
noun : an armored mammal with bony plates
armor
noun : any kind of protective covering
armpit
noun : the hollow area under the base of an arm where it joins the side of the chest
arms
noun : weapons or firearms
army
noun : a country's military force for fighting on land; a large number of people or things
aroma
noun : a pleasant smell that is very noticeable
arrangement
noun : a plan or agreement
array
noun : a large number or variety of things
arrival
noun : the process or act of arriving
arrow
noun : a long stick with a sharp tip at one end and feathers at the other end
arrowhead
noun : a hard, pointed wedge attached to the tip of an arrow
arroyo
noun : a deep gully in a dry region that was created by running water
arson
noun : the crime of setting a fire on purpose
arsonist
noun : a person who starts a fire on purpose
art form
noun : a kind of artistic expression, such as ballet, sculpture, writing, or painting
artery
noun : a blood vessel that moves oxygen-rich blood away from the heart to all parts of the body
arthritis
noun : a disease in which the joints swell and stiffen
article
noun : a complete piece of writing that is part of a newspaper, magazine, or other media
article
noun : one of a certain kind of thing
artifact
noun : any object made or used by humans long ago
artillery
noun : large guns that are too heavy to carry
artisan
noun : a person who is skilled at a craft or trade and who creates items by hand
artistry
noun : artistic ability
artwork
noun : a painting or other work of art made by a person rather than by nature
ascent
noun : movement upward in position, power, or importance
ash
noun : a medium to large tree in the olive family that has "winged" seeds
Asia
noun : the largest continent in the world, located east of Europe and almost entirely in the northern hemisphere
asparagus
noun : a tall plant in the lily family that has edible shoots and a slightly bitter flavor
aspect
noun : a part or feature of something
aspen
noun : a tree in the poplar family that has leaves that tremble when even a light wind blows
aspirin
noun : a pill commonly used to treat headaches that can also relieve other kinds of pain
assassin
noun : someone who carries out a plan to kill an important person by surprise attack
assassination
noun : the killing of a political leader or other public figure
assembly
noun : a large group of people who meet formally for a common purpose
assessment
noun : an evaluation or judgment of a person's knowledge or performance
assignment
noun : a task or job given to a person as part of a class or job
assimilation
noun : the act of adopting the dominant culture of a country
assistance
noun : the act of giving aid or support
assistance dog
noun : a dog trained to help someone who has a physical disability unrelated to sight
assistant
noun : a person who helps another person do a job
association
noun : a group of people with a common purpose, such as a club
assortment
noun : a group of things of different types
assumption
noun : something that is believed to be true without proof
asteroid
noun : an irregularly shaped rock that orbits the Sun
asthma
noun : a disease of the respiratory system that causes breathing difficulty
astonishment
noun : great surprise or amazement
astronaut
noun : a person trained to travel and work in space
astronomer
noun : a scientist who studies planets, stars, galaxies, and other objects in space
astronomy
noun : a field of science involving the study of the stars, planets, comets, and other things found in space
Athens
noun : one of the most important city-states in ancient Greece and the modern Greek capital
athlete
noun : a person trained in sports, games, or other activities that require strength, speed, and skill
athletic shoes
noun : shoes designed to provide support and comfort when participating in athletic activities
athletics
noun : active games and sports that require strength, speed, and skill
Atlanta
noun : the capital of Georgia, located in the north-central part of the state
Atlantic Ocean
noun : the ocean east of North and South America and west of Europe and Africa
Atlantis
noun : a legendary large island said to have sunk into the ocean long ago
atlas
noun : a book of maps
ATM
noun : an electronic machine that a bank customer can use for banking services, such as withdrawing or depositing money
atmosphere
noun : a layer of gases surrounding a planet, star, or moon
atmosphere
noun : the emotional tone or feeling associated with a time or place
atom
noun : the smallest part of an element
attachment
noun : a document or computer file attached to an email message
attacker
noun : a person who acts aggressively, often with a weapon, in an attempt to injure or kill
attention
noun : special care or notice given to someone or something
attic
noun : a room or space at the top of a house, just below the roof
attire
noun : clothes, especially fancy ones
attitude
noun : a certain way of thinking or feeling about something that is often shown in the way a person behaves
attorney
noun : a lawyer; a person who practices or studies law
attraction
noun : a person, thing, or type of entertainment that people enjoy
attraction
noun : the action, force, or process that draws objects or living things toward each other
attribute
noun : a characteristic or trait
auction
noun : a sale of goods or property at which buyers bid against each other, and the buyer who offers to pay the most wins
auctioneer
noun : a person whose job is to run an auction, or public sale
audience
noun : a group of people gathered to see and hear a performance or presentation
audio
noun : recorded sound
audition
noun : a performance by an actor, musician, or dancer that is a tryout
auditorium
noun : the part of a public building where an audience sits
Austin
noun : the capital of Texas
Australia
noun : an island country and continent in the South Pacific Ocean
Austria
noun : a landlocked country in central Europe
author
noun : a person who writes a book, play, story, or other written work
authority
noun : the power, or those with the power, to govern, give orders, or make decisions
authority
noun : a person or group of people that directs what others can or cannot do
autobiography
noun : a true story of a person's life, written by that person
autograph
noun : a signature, especially that of a famous person
automobile
noun : a vehicle on four wheels that has an engine and travels on roads
avalanche
noun : a mass of loosened snow, ice, soil, or rock that suddenly slides down a slope
avenue
noun : a wide road in a city or town, often with trees along the sides
average
noun : a number equal to the sum of a set of numbers divided by how many numbers are in the set
aviation
noun : the flying of aircraft
aviator
noun : a pilot of an aircraft
avocado
noun : an oval fruit with dark, leathery skin and smooth green flesh
avocation
noun : a career one pursues for enjoyment rather than as a job; a hobby
awe
noun : mixed feelings of wonder, fear, and respect
awl
noun : a sharp, pointed tool used to make holes
awning
noun : a sheet of heavy material stretched on a frame that is hung to keep sunlight or rain from a doorway, window, or deck
axes
noun : the imaginary lines around which objects, such as planets, might rotate
axis
noun : an imaginary line around which an object, such as Earth, rotates
axle
noun : a bar around which a wheel or wheels revolves
Ayers Rock
noun : a large sandstone rock formation in central Australia
aborigine
noun : an original or first inhabitant of an area
absentee ballot
noun : a ballot that a voter fills out and mails in instead of completing it in person
abyssal zone
noun : the ocean zone that includes the deep ocean floor
Achilles tendon
noun : a tendon that connects the calf muscle to the heel bone
acid rain
noun : rain that has an acidic pH due to pollution
Acropolis
noun : a series of fortified structures built on the top of a hill in ancient Athens, Greece
acrostic
noun : a poem in which certain letters, usually the first ones, form a name, word, or message when read vertically
acute angle
noun : an angle that measures less than 90º
acute triangle
noun : a triangle that has three acute angles
admiral
noun : a very high-ranking officer in a navy
adolescence
noun : the stage of the human life cycle between childhood and adulthood
advice column
noun : a column in a newspaper or magazine that offers advice about personal problems
Aegean Sea
noun : an arm of the Mediterranean Sea that is located between Greece and Turkey
aerodynamics
noun : the study of how air moves around the shape of an object
aerosol
noun : liquid or fine solid particles suspended in a gas
affliction
noun : pain; distress
aggregate
noun : bits of rock, gravel, or sand that are mixed with cement and water to make concrete
aileron
noun : a hinged surface attached to the back edge of an airplane's wing
air pressure
noun : the force of air in the atmosphere
aircraft carrier
noun : a large warship with a long, flat deck from which planes can take off and land
akh
noun : the soul and essence of a person, combining the personality and the ghostly form
albatross
noun : a very large seabird with long, narrow wings
albino
noun : a person or other animal with an absence of pigment in the skin, hair, and eyes
Alexander the Great
noun : a military leader of ancient Greece who conquered the Mediterranean, northern Africa, and much of central Asia
Algonquian
noun : any of a group of native North American tribes who speak a language that is part of the Algonquian family of languages
allegory
noun : a story in which the people, events, or things have hidden meanings
allele
noun : one of two or more alternative forms of a gene
allergen
noun : any substance that causes an allergic reaction
alliteration
noun : two or more words in a row that begin with the same sound
Allosaurus
noun : a large carnivorous dinosaur that walked upright on two legs
alloy
noun : a metal that is a combination of two or more metals
allusion
noun : a reference to a person, place, event, or thing assumed to be known
alluvial fan
noun : a fan-shaped area of sediment deposited by a river
Alps
noun : a large mountain range in south-central Europe
alternating current
noun : an electric current in which electrons move rapidly back and forth
alternative fuels
noun : fuels that are different from those most commonly used in the past
altimeter
noun : an instrument that measures altitude, or distance up from the ground
Amazon River
noun : a river that flows through South America near the equator to the Atlantic Ocean; the largest river in the world
amber
noun : the hard, fossilized resin from extinct trees of long ago
ambiance
noun : the atmosphere or mood of a place
American Revolution
noun : the conflict between Britain and the thirteen colonies that led to the independence of the United States (1775-1783)
amino acid
noun : a simple organic compound that is a building block of proteins
ammonia
noun : a colorless gas that has a pungent smell and can be dissolved in water to create a strong alkaline solution
amnesty
noun : an official pardon from punishment for a political offense
ampere
noun : the basic unit for measuring the amount of electric current in a wire
amplitude
noun : the height of a crest (or the depth of a trough) of a wave
amusement park
noun : a large, usually outdoor area that features entertainment such as rides, shows, and games
anagram
noun : a word or phrase created by reordering the letters of another word or phrase
anal fin
noun : the fin located beneath the tail of a fish
anarchy
noun : the absence of a formal system of government or order in a society
Anasazi
noun : an ancient Native American civilization of the Southwest known for building large cliff dwellings
Andes
noun : a long mountain chain along the Pacific coast of South America
Andronicus
noun : an astronomer, engineer, and architect from Syria who lived during the first century BC
anecdote
noun : a short, often humorous, account of an event or incident
anemometer
noun : an instrument that measures wind speed or pressure
anesthesia
noun : a medicine used to cause loss of sensitivity to pain
angiosperm
noun : a member of a large group of seed plants that produce flowers
Anglo
noun : a person of white European descent
animatronics
noun : the electronics that make models of creatures move as if they were alive
ankh
noun : an ancient Egyptian symbol of life, shaped like a cross but with a loop at the top
annals
noun : a record of events arranged by year
anthropomorphism
noun : the attribution of human characteristics to nonhuman things, such as animals, objects, and nature
anti-Semitism
noun : prejudice or discrimination against people who are Jewish
antibody
noun : a chemical produced by the body that attacks invading germs
antigen
noun : a substance that helps the body fight infection
Anubis
noun : the Egyptian jackal-headed god who was believed to lead the dead into the underworld
Apache
noun : a member of a group of Native Americans in the Southwest; the language of these people
apartheid
noun : an official policy of racial segregation in South Africa, now ended, that discriminated against people who were not white
Apatosaurus
noun : a huge herbivorous dinosaur with a long neck and tail
aphotic zone
noun : the bottom zone of the ocean, which receives no sunlight
Aphrodite
noun : the ancient Greek goddess of love and beauty
Apollo
noun : the ancient Greek and Roman god of light, intellect, and healing
apprenticeship
noun : a period of on-the-job training used to learn a skill or trade
appropriation
noun : a law earmarking money for a particular use
aquifer
noun : an underground layer of rock, sand, or other material through which groundwater flows
aquitard
noun : a geological deposit that restricts the flow of water from one aquifer to another
arachnid
noun : a member of a group of arthropods that have two body segments and eight legs; includes spiders and scorpions
archaeological site
noun : a place where people find evidence of past human activity, such as trash or parts of buildings
Archaeopteryx
noun : the oldest known ancestor of birds
archerfish
noun : a freshwater fish that catches bugs by spitting water at them and causing them to fall into the water
archipelago
noun : a cluster or chain of islands
Arctic Circle
noun : an imaginary line circling Earth near the North Pole
Argentinosaurus
noun : an herbivorous dinosaur that may have been the largest land animal ever to live
aristocracy
noun : a form of government in which a country's upper-class citizens hold power; also the upper-class citizens themselves
Aristotle
noun : an ancient Greek philosopher and early scientist
armada
noun : a fleet of warships
armed forces
noun : groups of people who are specially trained and equipped to fight for a nation
armistice
noun : a wartime truce
armorer
noun : a person who makes, repairs, tests, or supplies firearms or armor
Art Nouveau
noun : a style of decoration that depicts leaves and flowers in long, curvy lines
arthropod
noun : a member of a group of invertebrates that have a segmented body, an exoskeleton, and jointed limbs; includes insects, arachnids, and crustaceans
artificial satellite
noun : a human-made object that orbits another object in space
asbestos
noun : a mineral made of long, fibrous crystals that is toxic when breathed
assonance
noun : the repetition of two or more vowel sounds, especially in words that are close together in a poem
Assyrian Empire
noun : an ancient empire that extended over the Middle East, Egypt, and Turkey during Biblical times
asterism
noun : a star-shaped reflective pattern inside a gem; a group of stars smaller than a constellation
asteroid belt
noun : the area in space between Mars and Jupiter where most asteroids orbit
astronomical satellite
noun : a research satellite that monitors waves and particles in deep space
astrophysics
noun : a branch of astronomy that is concerned with the physical nature of stars and other bodies in space
Atacama Desert
noun : the high-desert region in northern Chile
Athena
noun : the ancient Greek goddess of war and wisdom; the patron goddess of Athens
atoll
noun : a circular reef formed when coral grows around an island that later sinks beneath the surface of the sea
atomic bomb
noun : an explosive device that releases a huge amount of energy through the process of nuclear fission
audiologist
noun : a medical specialist who tests a person's hearing, identifies hearing impairments, and helps treat hearing impairments
aurora borealis
noun : the northern lights, caused by charged particles being pulled into Earth's atmosphere by Earth's magnetic field
Australian Aborigine
noun : a member of the native people of Australia who lived there before Europeans came
author's purpose
noun : the reason an author writes a piece
Aztecs
noun : a people and civilization of ancient Mexico
azure
noun : bright blue