American coot
— Noun
– English
～ a coot found in North America
Aaron Copland
— Noun
– English
～ United States composer who developed a distinctly American music (1900-1990)
American copper
— Noun
– English
～ common copper butterfly of central and eastern North America
Arnica cordifolia
— Noun
– English
～ wildflower with heart-shaped leaves and broad yellow flower heads; of alpine areas west of the Rockies from Alaska to southern California
Aster cordifolius
— Noun
– English
～ perennial wood aster of eastern North America
atrium cordis
— Noun
– English
～ the upper chamber of each half of the heart
Arcangelo Corelli
— Noun
– English
～ Italian violinist and composer of violin concertos (1653-1713)
amen corner
— Noun
– English
～ area reserved for persons leading the responsive `amens'
Anhima cornuta
— Noun
– English
～ screamer having a hornlike process projecting from the forehead
arteria coronaria
— Noun
– English
～ the artery that branches from the aorta to supply blood to the heart
Air Corps
— Noun
– English
～ formerly the airborne division of the United States Army
army corps
— Noun
– English
～ an army unit usually consisting of two or more divisions and their support
Angelo Correr
— Noun
– English
～ the Italian pope from 1406 to 1415 who worked to end the Great Schism and who retired to make it possible (1327-1417)
Armata Corsa
— Noun
– English
～ a terrorist organization founded in 1999 to oppose the link between nationalists and the Corsican mafia; "the attacks of Armata Corsa are aimed at symbolic targets of colonialism in Corsica"
auditory cortex
— Noun
– English
～ the cortical area that receives auditory information from the medial geniculate body
association cortex
— Noun
– English
～ cortical areas that are neither motor or sensory but are thought to be involved in higher processing of information
adrenal cortex
— Noun
– English
～ the cortex of the adrenal gland; secretes corticosterone and sex hormones
arc cosecant
— Noun
– English
～ the angle that has a cosecant equal to a given number
arc cosine
— Noun
– English
～ the inverse function of the cosine; the angle that has a cosine equal to a given number
at any cost
— Adverb
– English
～ regardless of the cost involved; "he wanted to save her life at all cost"