| blackcock | (noun) male black grouse | Synonyms: black cock |
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| blastocoel | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocele, blastocoele, cleavage cavity, segmentation cavity |
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| blastocoele | (noun) the fluid-filled cavity inside a blastula | Synonyms: blastocele, blastocoel, cleavage cavity, segmentation cavity |
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| blastomycosis | (noun) any of several infections of the skin or mucous membrane caused by Blastomyces | - |
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| bluecoat | (noun) a person dressed all in blue (as a soldier or sailor) | - |
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| bocconia | (noun) small Central American tree having loose racemes of purple-tinted green flowers | Synonyms: Bocconia frutescens, tree celandine |
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| (noun) herb of China and Japan widely cultivated for its plumelike panicles of creamy white flowers | Synonyms: Macleaya cordata, plume poppy |
| borecole | (noun) a hardy cabbage with coarse curly leaves that do not form a head | Synonyms: Brassica oleracea acephala, cole, colewort, kail, kale |
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| boycott | (noun) a group's refusal to have commercial dealings with some organization in protest against its policies | - |
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| bricolage | (noun) construction of something by whatever material are available | - |
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| bricole | (noun) catapult operated by manpower pulling cords attached to a lever and slign to launch projectiles | Synonyms: mangonel, traction trebuchet |
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| broccoli | (noun) branched green undeveloped flower heads | - |
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| (noun) plant with dense clusters of tight green flower buds | Synonyms: Brassica oleracea italica |
| bronchoscope | (noun) a slender tubular instrument used to examine the bronchial tubes | - |
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| bronco | (noun) an unbroken or imperfectly broken mustang | Synonyms: bronc, broncho |
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| broncobuster | (noun) a person who breaks horses | Synonyms: bronco buster, buster |
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| broomcorn | (noun) tall grasses grown for the elongated stiff-branched panicle used for brooms and brushes | Synonyms: Sorghum vulgare technicum |
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| bucolic | (noun) a short poem descriptive of rural or pastoral life | Synonyms: eclogue, idyl, idyll |
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| (noun) a country person | Synonyms: peasant, provincial |
| bunco | (noun) a swindle in which you cheat at gambling or persuade a person to buy worthless property | Synonyms: bunco game, bunko, bunko game, con, con game, confidence game, confidence trick, flimflam, hustle, sting |
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| buncombe | (noun) unacceptable behavior (especially ludicrously false statements) | Synonyms: bunk, bunkum, guff, hogwash, rot |
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| butterscotch | (noun) a hard brittle candy made with butter and brown sugar | - |
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| cacodaemon | (noun) an evil spirit | Synonyms: cacodemon |
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| cacodemon | (noun) an evil spirit | Synonyms: cacodaemon |
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| cacodyl | (noun) the univalent group derived from arsine | Synonyms: arsenic group, cacodyl group, cacodyl radical |
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| (noun) a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air | Synonyms: tetramethyldiarsine |
| cacoethes | (noun) an irrational but irresistible motive for a belief or action | Synonyms: mania, passion |
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| cacogenesis | (noun) inability to produce hybrids that are both viable and fertile | - |
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| cacogenics | (noun) the study of the operation of factors causing degeneration in the type of offspring produced | Synonyms: dysgenics |
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| cacography | (noun) poor handwriting | Synonyms: scratch, scrawl, scribble |
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| cacomistle | (noun) raccoon-like omnivorous mammal of Mexico and the southwestern United States having a long bushy tail with black and white rings | Synonyms: Bassariscus astutus, bassarisk, cacomixle, civet cat, coon cat, miner's cat, raccoon fox, ring-tailed cat, ringtail |
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| cacomixle | (noun) raccoon-like omnivorous mammal of Mexico and the southwestern United States having a long bushy tail with black and white rings | Synonyms: Bassariscus astutus, bassarisk, cacomistle, civet cat, coon cat, miner's cat, raccoon fox, ring-tailed cat, ringtail |
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| cacophony | (noun) loud confusing disagreeable sounds | - |
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| (noun) a loud harsh or strident noise | Synonyms: blare, blaring, clamor, din |
| calico | (noun) coarse cloth with a bright print | - |
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| camcorder | (noun) a portable television camera and videocassette recorder | - |
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| caracolito | (noun) large Costa Rican tree having light-colored wood suitable for cabinetry; similar to the African lepidobotrys in wood structure as well as in fruit and flowers and leaves and seeds; often classified in other families | Synonyms: Ruptiliocarpon caracolito |
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| carcinosarcoma | (noun) a malignant neoplasm composed of carcinoma and sarcoma extensively intermixed | - |
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| carrycot | (noun) box-shaped baby bed with handles (for a baby to sleep in while being carried) | - |
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| catacomb | (noun) an underground tunnel with recesses where bodies were buried (as in ancient Rome) | - |
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| catholicon | (noun) hypothetical remedy for all ills or diseases; once sought by the alchemists | Synonyms: cure-all, nostrum, panacea |
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| celecoxib | (noun) a Cox-2 inhibitor (trade name Celebrex) that relieves pain and inflammation without harming the digestive tract | Synonyms: Celebrex |
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| celioscopy | (noun) endoscopic examination of the abdomen through the abdominal wall | - |
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| chalcocite | (noun) a heavy grey mineral that is an ore of copper | Synonyms: copper glance |
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| chalcopyrite | (noun) a yellow copper ore (CuFeS2) made up of copper and iron sulfide | Synonyms: copper pyrites |
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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 |
| chawbacon | (noun) a person who is not very intelligent or interested in culture | Synonyms: bumpkin, hayseed, hick, rube, yahoo, yokel |
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| cheiloscopy | (noun) a forensic investigation technique that deals with identification of humans based on lip traces. | - |
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| chicory | (noun) crisp spiky leaves with somewhat bitter taste | Synonyms: curly endive |
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| (noun) root of the chicory plant roasted and ground to substitute for or adulterate coffee | Synonyms: chicory root |
| (noun) perennial Old World herb having rayed flower heads with blue florets cultivated for its root and its heads of crisp edible leaves used in salads | Synonyms: chicory plant, Cichorium intybus, succory |
| (noun) the dried root of the chicory plant: used as a coffee substitute | Synonyms: chicory root |
| chicot | (noun) handsome tree of central and eastern North America having large bipinnate leaves and green-white flowers followed by large woody brown pods whose seeds are used as a coffee substitute | Synonyms: bonduc, Gymnocladus dioica, Kentucky coffee tree |
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| chloramphenicol | (noun) an oral antibiotic (trade name Chloromycetin) used to treat serious infections (especially typhoid fever) | Synonyms: Chloromycetin |
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| chocolate | (noun) a medium brown to dark-brown color | Synonyms: burnt umber, coffee, deep brown, umber |
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| (noun) a food made from roasted ground cacao beans | - |
| (noun) a beverage made from cocoa powder and milk and sugar; usually drunk hot | Synonyms: cocoa, drinking chocolate, hot chocolate |
| chondrosarcoma | (noun) a malignant neoplasm of cartilage cells | - |
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| chromoblastomycosis | (noun) a fungal infection characterized by itchy warty nodules on the skin | - |
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| chronoscope | (noun) an instrument for accurate measurements of small intervals of time | - |
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| cisco | (noun) important food fish of cold deep lakes of North America | Synonyms: Coregonus artedi, lake herring |
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| (noun) cold-water fish caught in Lake Superior and northward | Synonyms: lake herring |
| 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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| cob | (noun) adult male swan | - |
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| (noun) stocky short-legged harness horse | - |
| (noun) white gull having a black back and wings | Synonyms: black-backed gull, great black-backed gull, Larus marinus |
| (noun) nut of any of several trees of the genus Corylus | Synonyms: cobnut, filbert, hazelnut |
| cobalamin | (noun) a B vitamin that is used to treat pernicious anemia | Synonyms: antipernicious anemia factor, cyanocobalamin, vitamin B12 |
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| cobalt | (noun) a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition | Synonyms: atomic number 27, Co |
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| cobaltite | (noun) a rare silvery-white mineral; important ore of cobalt | - |
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| cobber | (noun) Australian term for a pal | - |
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| cobble | (noun) rectangular paving stone with curved top; once used to make roads | Synonyms: cobblestone, sett |
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