| coca | (noun) dried leaves of the coca plant (and related plants that also contain cocaine); chewed by Andean people for their stimulating effect | - |
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| (noun) a South American shrub whose leaves are chewed by natives of the Andes; a source of cocaine | Synonyms: coca plant, Erythroxylon coca |
| cocain | (noun) a narcotic (alkaloid) extracted from coca leaves; used as a surface anesthetic or taken for pleasure; can become powerfully addictive | Synonyms: cocaine |
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| cocaine | (noun) a narcotic (alkaloid) extracted from coca leaves; used as a surface anesthetic or taken for pleasure; can become powerfully addictive | Synonyms: cocain |
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| cocarboxylase | (noun) a coenzyme important in respiration in the Krebs cycle | Synonyms: thiamine pyrophosphate |
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| cocci | (noun) any spherical or nearly spherical bacteria | Synonyms: coccus |
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| coccidioidomycosis | (noun) an infection of the lungs and skin characterized by excessive sputum and nodules | Synonyms: coccidiomycosis, desert rheumatism, valley fever |
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| coccidiomycosis | (noun) an infection of the lungs and skin characterized by excessive sputum and nodules | Synonyms: coccidioidomycosis, desert rheumatism, valley fever |
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| coccidiosis | (noun) (veterinary medicine) infestation with coccidia | - |
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| coccidium | (noun) parasitic on the digestive epithelium of vertebrates and higher invertebrates | Synonyms: eimeria |
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| coccobacillus | (noun) a bacterial cell intermediate in morphology between a coccus and a bacillus; a very short bacillus | - |
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| coccus | (noun) any spherical or nearly spherical bacteria | Synonyms: cocci |
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| coccyx | (noun) the end of the vertebral column in humans and tailless apes | Synonyms: tail bone |
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| cochin | (noun) Asian breed of large fowl with dense plumage and feathered legs | Synonyms: cochin china |
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| cochineal | (noun) Mexican red scale insect that feeds on cacti; the source of a red dye | Synonyms: cochineal insect, Dactylopius coccus |
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| (noun) a red dyestuff consisting of dried bodies of female cochineal insects | - |
| cochlea | (noun) the snail-shaped tube (in the inner ear coiled around the modiolus) where sound vibrations are converted into nerve impulses by the organ of Corti | - |
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| cock | (noun) adult male bird | - |
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| (noun) adult male chicken | Synonyms: rooster |
| (noun) faucet consisting of a rotating device for regulating flow of a liquid | Synonyms: stopcock, turncock |
| (noun) the part of a gunlock that strikes the percussion cap when the trigger is pulled | Synonyms: hammer |
| (noun) obscene terms for penis | Synonyms: dick, pecker, prick, putz, shaft, tool |
| cockade | (noun) an ornament (such as a knot of ribbon or a rosette) usually worn on the hat | - |
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| cockateel | (noun) small grey Australian parrot with a yellow crested head | Synonyms: cockatiel, cockatoo parrot, Nymphicus hollandicus |
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| cockatiel | (noun) small grey Australian parrot with a yellow crested head | Synonyms: cockateel, cockatoo parrot, Nymphicus hollandicus |
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| cockatoo | (noun) white or light-colored crested parrot of the Australian region; often kept as cage birds | - |
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| cockatrice | (noun) monster hatched by a reptile from a cock's egg; able to kill with a glance | - |
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| cockchafer | (noun) any of various large European beetles destructive to vegetation as both larvae and adult | Synonyms: May beetle, May bug, Melolontha melolontha |
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| cockcrow | (noun) the first light of day | Synonyms: aurora, break of day, break of the day, dawn, dawning, daybreak, dayspring, first light, morning, sunrise, sunup |
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| cocker | (noun) a small breed with wavy silky hair; originally developed in England | Synonyms: cocker spaniel, English cocker spaniel |
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| cockerel | (noun) a young domestic cock; not older than one year | - |
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| cockfight | (noun) a match in a cockpit between two fighting cocks heeled with metal gaffs | - |
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| cockfighting | (noun) participation in the sport of matching gamecocks in a cockfight | - |
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| cockhorse | (noun) anything used as a toy horse (such as a rocking horse or one knee of an adult) | - |
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| cockiness | (noun) offensive boldness and assertiveness | Synonyms: bumptiousness, forwardness, pushiness |
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| cockle | (noun) common edible, burrowing European bivalve mollusk that has a strong, rounded shell with radiating ribs | - |
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| (noun) common edible European bivalve | - |
| cocklebur | (noun) any coarse weed of the genus Xanthium having spiny burrs | Synonyms: cockle-bur, cockle-burr, cockleburr |
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| (noun) burdock having heart-shaped leaves found in open woodland, hedgerows and rough grassland of Europe (except extreme N) and Asia Minor; sometimes cultivated for medicinal and culinary use | Synonyms: Arctium lappa, great burdock, greater burdock |
| cockleburr | (noun) any coarse weed of the genus Xanthium having spiny burrs | Synonyms: cockle-bur, cockle-burr, cocklebur |
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| cockleshell | (noun) a small light flimsy boat | - |
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| cockloft | (noun) a small loft or garret | - |
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| cockney | (noun) the nonstandard dialect of natives of the east end of London | - |
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| cockpit | (noun) compartment where the pilot sits while flying the aircraft | - |
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| (noun) seat where the driver sits while driving a racing car | - |
| (noun) a pit for cockfights | - |
| cockroach | (noun) any of numerous chiefly nocturnal insects; some are domestic pests | Synonyms: roach |
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| cockscomb | (noun) the fleshy red crest on the head of the domestic fowl and other gallinaceous birds | Synonyms: comb, coxcomb |
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| (noun) a cap worn by court jesters; adorned with a strip of red | Synonyms: coxcomb |
| (noun) a conceited dandy who is overly impressed by his own accomplishments | Synonyms: coxcomb |
| (noun) garden annual with featherlike spikes of red or yellow flowers | Synonyms: Celosia argentea cristata, Celosia cristata, common cockscomb |
| cocksfoot | (noun) widely grown stout Old World hay and pasture grass | Synonyms: cockspur, Dactylis glomerata, orchard grass |
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| cockspur | (noun) small spiny West Indian tree | Synonyms: Pisonia aculeata |
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| (noun) widely grown stout Old World hay and pasture grass | Synonyms: cocksfoot, Dactylis glomerata, orchard grass |
| cocksucker | (noun) insulting terms of address for people who are stupid or irritating or ridiculous | Synonyms: asshole, bastard, dickhead, mother fucker, motherfucker, prick, shit, SOB, son of a bitch, whoreson |
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| (noun) a person who performs fellatio | - |
| cocksureness | (noun) total certainty or greater certainty than circumstances warrant | Synonyms: certitude, overconfidence |
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| cocktail | (noun) a short mixed drink | - |
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| (noun) an appetizer served as a first course at a meal | - |
| cockup | (noun) something badly botched or muddled | Synonyms: balls-up, ballup, mess-up |
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| coco | (noun) tall palm tree bearing coconuts as fruits; widely planted throughout the tropics | Synonyms: coco palm, cocoa palm, coconut, coconut palm, coconut tree, Cocos nucifera |
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| cocoa | (noun) powder of ground roasted cacao beans with most of the fat removed | - |
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| (noun) a beverage made from cocoa powder and milk and sugar; usually drunk hot | Synonyms: chocolate, drinking chocolate, hot chocolate |
| cocoanut | (noun) large hard-shelled oval nut with a fibrous husk containing thick white meat surrounding a central cavity filled (when fresh) with fluid or milk | Synonyms: coconut |
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| cocobolo | (noun) a valuable timber tree of tropical South America | Synonyms: Dalbergia retusa |
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| coconspirator | (noun) a member of a conspiracy | Synonyms: conspirator, machinator, plotter |
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| coconut | (noun) large hard-shelled oval nut with a fibrous husk containing thick white meat surrounding a central cavity filled (when fresh) with fluid or milk | Synonyms: cocoanut |
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| (noun) the edible white meat of a coconut; often shredded for use in e.g. cakes and curries | Synonyms: coconut meat |
| (noun) tall palm tree bearing coconuts as fruits; widely planted throughout the tropics | Synonyms: coco, coco palm, cocoa palm, coconut palm, coconut tree, Cocos nucifera |
| cocoon | (noun) silky envelope spun by the larvae of many insects to protect pupas and by spiders to protect eggs | - |
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| cocooning | (noun) retreating to the seclusion of your home (as for privacy or escape) | - |
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| cocoswood | (noun) wood of the granadilla tree used for making musical instruments especially clarinets | Synonyms: cocuswood, granadilla wood |
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| cocotte | (noun) a small casserole in which individual portions can be cooked and served | - |
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| (noun) a woman who engages in sexual intercourse for money | Synonyms: bawd, cyprian, fancy woman, harlot, lady of pleasure, prostitute, sporting lady, tart, whore, woman of the street, working girl |
| cocoyam | (noun) tropical starchy tuberous root | Synonyms: dasheen, edda, taro, taro root |
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| (noun) edible starchy tuberous root of taro plants | Synonyms: dasheen, eddo, taro |
| cocozelle | (noun) squash resembling zucchini | - |
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| (noun) squash plant having dark green fruit with skin mottled with light green or yellow | Synonyms: Italian vegetable marrow |
| cocuswood | (noun) wood of the granadilla tree used for making musical instruments especially clarinets | Synonyms: cocoswood, granadilla wood |
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