| anticoagulant | (noun) medicine that prevents or retards the clotting of blood | Synonyms: anticoagulant medication, decoagulant |
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| anticoagulation | (noun) the administration of an anticoagulant drug to retard coagulation of the blood | - |
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| bluecoat | (noun) a person dressed all in blue (as a soldier or sailor) | - |
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| charcoal | (noun) a stick of black carbon material used for drawing | Synonyms: fusain |
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| (noun) a drawing made with a stick of black carbon material | - |
| (noun) a very dark grey color | Synonyms: charcoal gray, charcoal grey, oxford gray, oxford grey |
| (noun) a carbonaceous material obtained by heating wood or other organic matter in the absence of air | Synonyms: wood coal |
| coach | (noun) a carriage pulled by four horses with one driver | Synonyms: coach-and-four, four-in-hand |
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| (noun) a railcar where passengers ride | Synonyms: carriage, passenger car |
| (noun) a vehicle carrying many passengers; used for public transport | Synonyms: autobus, bus, charabanc, double-decker, jitney, motorbus, motorcoach, omnibus, passenger vehicle |
| (noun) a person who gives private instruction (as in singing, acting, etc.) | Synonyms: private instructor, tutor |
| (noun) (sports) someone in charge of training an athlete or a team | Synonyms: handler, manager |
| coachbuilder | (noun) a craftsman who makes the bodies of motor vehicles | - |
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| coaching | (noun) the job of a professional coach | Synonyms: coaching job |
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| coachman | (noun) a man who drives a coach (or carriage) | - |
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| coachwhip | (noun) a whipsnake of southern United States and Mexico; tail resembles a braided whip | Synonyms: coachwhip snake, Masticophis flagellum |
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| (noun) desert shrub of southwestern United States and Mexico having slender naked spiny branches that after the rainy season put forth foliage and clusters of red flowers | Synonyms: Fouquieria splendens, Jacob's staff, ocotillo, vine cactus |
| coaction | (noun) act of working jointly | Synonyms: collaboration |
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| coadjutor | (noun) an assistant to a bishop | - |
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| coagulant | (noun) an agent that produces coagulation | Synonyms: coagulator |
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| coagulase | (noun) an enzyme that induces coagulation | - |
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| coagulation | (noun) the process of forming semisolid lumps in a liquid | Synonyms: clotting, curdling |
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| coagulator | (noun) an agent that produces coagulation | Synonyms: coagulant |
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| coagulum | (noun) a lump of material formed from the content of a liquid | Synonyms: clot |
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| coal | (noun) a hot fragment of wood or coal that is left from a fire and is glowing or smoldering | Synonyms: ember |
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| (noun) fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period | - |
| coalbin | (noun) a bin for holding coal | Synonyms: coalhole |
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| coalescence | (noun) the union of diverse things into one body or form or group; the growing together of parts | Synonyms: coalescency, coalition, concretion, conglutination |
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| coalescency | (noun) the union of diverse things into one body or form or group; the growing together of parts | Synonyms: coalescence, coalition, concretion, conglutination |
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| coalface | (noun) the part of a coal seam that is being cut | - |
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| coalfield | (noun) a region where there is coal underground | - |
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| coalhole | (noun) a bin for holding coal | Synonyms: coalbin |
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| coalition | (noun) the union of diverse things into one body or form or group; the growing together of parts | Synonyms: coalescence, coalescency, concretion, conglutination |
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| (noun) an organization of people (or countries) involved in a pact or treaty | Synonyms: alignment, alinement, alliance |
| (noun) the state of being combined into one body | Synonyms: fusion |
| coalman | (noun) someone who delivers coal | - |
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| coalpit | (noun) a mine where coal is dug from the ground | Synonyms: coal mine |
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| coaming | (noun) a raised framework around a hatchway on a ship to keep water out | - |
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| coarctation | (noun) (biology) a narrowing or constriction of a vessel or canal; especially a congenital narrowing of the aorta | - |
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| (noun) tight or narrow compression | Synonyms: constriction |
| coarseness | (noun) looseness or roughness in texture (as of cloth) | Synonyms: nubbiness, tweediness |
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| (noun) the quality of being composed of relatively large particles | Synonyms: graininess, granularity |
| (noun) the quality of lacking taste and refinement | Synonyms: commonness, grossness, raunch, vulgarism, vulgarity |
| (noun) language or humor that is down-to-earth | Synonyms: saltiness |
| coast | (noun) the act of moving smoothly along a surface while remaining in contact with it | Synonyms: glide, slide |
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| (noun) the area within view | - |
| (noun) the shore of a sea or ocean | Synonyms: sea-coast, seacoast, seashore |
| (noun) a slope down which sleds may coast | - |
| coaster | (noun) a covering (plate or mat) that protects the surface of a table (i.e., from the condensation on a cold glass or bottle) | - |
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| (noun) someone who coasts | - |
| (noun) a resident of a coastal area | - |
| coastguard | (noun) a military service responsible for the safety of maritime traffic in coastal waters | - |
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| coastguardsman | (noun) a member of a coastguard | - |
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| coastland | (noun) land in a coastal area | - |
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| coastline | (noun) the outline of a coast | - |
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| coat | (noun) growth of hair or wool or fur covering the body of an animal | Synonyms: pelage |
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| (noun) an outer garment that has sleeves and covers the body from shoulder down; worn outdoors | - |
| (noun) a thin layer covering something | Synonyms: coating |
| coatdress | (noun) a dress that is tailored like a coat and buttons up the front | - |
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| coatee | (noun) a short close-fitting coat | - |
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| coati | (noun) omnivorous mammal of Central America and South America | Synonyms: coati-mondi, coati-mundi, coon cat, Nasua narica |
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| coating | (noun) the work of applying something | Synonyms: application, covering |
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| (noun) a thin layer covering something | Synonyms: coat |
| (noun) a heavy fabric suitable for coats | - |
| (noun) a decorative texture or appearance of a surface (or the substance that gives it that appearance) | Synonyms: finish, finishing |
| coatrack | (noun) a rack with hooks for temporarily holding coats and hats | Synonyms: coat rack, hatrack |
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| coatroom | (noun) a room where coats and other articles can be left temporarily | Synonyms: cloakroom |
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| coattail | (noun) the loose back flap of a coat that hangs below the waist | - |
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| coauthor | (noun) a writer who collaborates with others in writing something | Synonyms: joint author |
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| coax | (noun) a transmission line for high-frequency signals | Synonyms: coax cable, coaxial cable |
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| coaxer | (noun) someone who tries to persuade by blandishment and coaxing | Synonyms: wheedler |
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| coaxing | (noun) flattery designed to gain favor | Synonyms: blarney, soft soap, sweet talk |
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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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| curacoa | (noun) flavored with sour orange peel | Synonyms: curacao |
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| decoagulant | (noun) medicine that prevents or retards the clotting of blood | Synonyms: anticoagulant, anticoagulant medication |
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| greatcoat | (noun) a heavy coat worn over clothes in winter | Synonyms: overcoat, topcoat |
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| housecoat | (noun) a loose dressing gown for women | Synonyms: neglige, negligee, peignoir, wrapper |
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| hypercoaster | (noun) a roller coaster that goes up 200 feet or higher and can catapult riders from 0 to 70 mph in 4 seconds by motors originally designed to launch rockets | - |
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| motorcoach | (noun) a vehicle carrying many passengers; used for public transport | Synonyms: autobus, bus, charabanc, coach, double-decker, jitney, motorbus, omnibus, passenger vehicle |
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| overcoat | (noun) a heavy coat worn over clothes in winter | Synonyms: greatcoat, topcoat |
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| (noun) an additional protective coating (as of paint or varnish) | Synonyms: overcoating |
| overcoating | (noun) an additional protective coating (as of paint or varnish) | Synonyms: overcoat |
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| peacoat | (noun) a sailor's heavy woolen double-breasted jacket | Synonyms: pea jacket |
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| petticoat | (noun) undergarment worn under a skirt | Synonyms: half-slip, underskirt |
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| photocoagulation | (noun) surgical procedure that uses an intense laser beam to destroy diseased retinal tissue or to make a scar that will hold the retina in cases of detached retina | - |
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| photocoagulator | (noun) surgical instrument containing a laser for use in photocoagulation | - |
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| raincoat | (noun) a water-resistant coat | Synonyms: waterproof |
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| redcoat | (noun) British soldier; so-called because of his red coat (especially during the American Revolution) | Synonyms: lobsterback |
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| seacoast | (noun) the shore of a sea or ocean | Synonyms: coast, sea-coast, seashore |
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| slowcoach | (noun) someone who moves slowly | Synonyms: plodder, slowpoke, stick-in-the-mud |
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| stagecoach | (noun) a large coach-and-four formerly used to carry passengers and mail on regular routes between towns | Synonyms: stage |
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| surcoat | (noun) a tunic worn over a knight's armor | - |
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| (noun) a loose outer coat usually of rich material | - |
| tailcoat | (noun) formalwear consisting of full evening dress for men | Synonyms: dress suit, full dress, tail coat, tails, white tie, white tie and tails |
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| thermocoagulation | (noun) congealing tissue by heat (as by electric current) | - |
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| topcoat | (noun) a heavy coat worn over clothes in winter | Synonyms: greatcoat, overcoat |
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| turncoat | (noun) a disloyal person who betrays or deserts his cause or religion or political party or friend etc. | Synonyms: apostate, deserter, ratter, recreant, renegade |
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| undercoat | (noun) thick soft fur lying beneath the longer and coarser guard hair | Synonyms: underfur |
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| (noun) the first or preliminary coat of paint or size applied to a surface | Synonyms: flat coat, ground, primer, primer coat, priming, priming coat |
| (noun) seal consisting of a coating of a tar or rubberlike material on the underside of a motor vehicle to retard corrosion | Synonyms: underseal |
| waistcoat | (noun) a man's sleeveless garment worn underneath a coat | Synonyms: vest |
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