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cobelligerent a nation not formally allied but cooperating with one or more nations waging war.
cobia a large tropical game fish with a prominent black stripe on either side.
COBOL a computer language using English syntax and a large vocabulary of English words (acronym for "common business-oriented language").
cobra any of several venomous snakes of Asia and Africa that rear up and flatten the skin of the neck when threatened. [2 definitions]
cobweb a web spun by a spider, or a single strand of this web. [5 definitions]
coca either of two shrubs native to the Andes, the dried leaves of which are the source of cocaine and other alkaloids. [2 definitions]
cocaine a substance extracted from coca leaves and used as a surface anesthetic or, often illegally, as a stimulating drug.
cocaptain combined form of captain.
cocatalyst combined form of catalyst.
-coccal of, concerning, or caused by a (specified) coccus.
-coccus a round or berry-shaped microorganism.
coccus a sphere-shaped bacterium.
coccyx the small triangular bone at the lower end of the spinal column, consisting of several fused vertebrae.
cochair combined form of chair.
cochairman combined form of chairman.
cochairperson combined form of chairperson.
cochairwoman combined form of chairwoman.
cochampion combined form of champion.
cochin one of a large Asiatic breed of domestic fowl with thickly feathered legs.
cochineal a bright red dye made from the bodies of female scale insects.
cochineal insect any of a family of tropical insects that feeds on certain cactuses, esp. in Mexico, the female of which is the source of a brilliant red dye.