| circumference | (noun) the size of something as given by the distance around it | Synonyms: perimeter |
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| (noun) the length of the closed curve of a circle | - |
| (noun) the boundary line encompassing an area or object | Synonyms: circuit |
| circumstance | (noun) information that should be kept in mind when making a decision | Synonyms: condition, consideration |
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| (noun) formal ceremony about important occasions | - |
| (noun) a condition that accompanies or influences some event or activity | - |
| (noun) the set of facts or circumstances that surround a situation or event | Synonyms: context, setting |
| cirque | (noun) a steep-walled semicircular basin in a mountain; may contain a lake | Synonyms: corrie, cwm |
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| cirripede | (noun) marine crustaceans with feathery food-catching appendages; free-swimming as larvae; as adults form a hard shell and live attached to submerged surfaces | Synonyms: barnacle, cirriped |
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| cite | (noun) a short note recognizing a source of information or of a quoted passage | Synonyms: acknowledgment, citation, credit, mention, quotation, reference |
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| citole | (noun) a 16th century musical instrument resembling a guitar with a pear-shaped soundbox and wire strings | Synonyms: cither, cithern, cittern, gittern |
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| citrange | (noun) more aromatic and acid tasting than oranges; used in beverages and marmalade | - |
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| (noun) more aromatic and acidic than oranges | Synonyms: citrange tree, Citroncirus webberi |
| citrate | (noun) a salt or ester of citric acid | - |
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| citrine | (noun) semiprecious yellow quartz resembling topaz | - |
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| citrulline | (noun) an amino acid that does not occur in proteins but is an intermediate in the conversion of ornithine to arginine | - |
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| cityscape | (noun) painting depicting a city or urban area | - |
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| (noun) a viewpoint toward a city or other heavily populated area | - |
| cive | (noun) perennial having hollow cylindrical leaves used for seasoning | Synonyms: Allium schoenoprasum, chive, chives, schnittlaugh |
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| clade | (noun) a group of biological taxa or species that share features inherited from a common ancestor | - |
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| cladode | (noun) a flattened stem resembling and functioning as a leaf | Synonyms: cladophyll, phylloclad, phylloclade |
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| clairvoyance | (noun) apparent power to perceive things that are not present to the senses | Synonyms: E.S.P., ESP, extrasensory perception, second sight |
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| clambake | (noun) a cookout at the seashore where clams and fish and other foods are cooked--usually on heated stones covered with seaweed | - |
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| claque | (noun) a group of followers hired to applaud at a performance | - |
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| clarence | (noun) a closed carriage with four wheels and seats for four passengers | - |
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| classmate | (noun) an acquaintance that you go to school with | Synonyms: class fellow, schoolfellow, schoolmate |
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| clause | (noun) (grammar) an expression including a subject and predicate functioning as a part of a complex sentence | - |
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| (noun) a separate section of a legal document (as a statute or contract or will) | Synonyms: article |
| claustrophobe | (noun) a person suffering from claustrophobia | - |
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| clavicle | (noun) bone linking the scapula and sternum | Synonyms: collarbone |
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| claymore | (noun) an antipersonnel land mine whose blast is aimed at the oncoming enemy | Synonyms: claymore mine |
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| (noun) a large double-edged broadsword; formerly used by Scottish Highlanders | - |
| claystone | (noun) fine-grained rock consisting of compacted clay particles | - |
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| clayware | (noun) ceramic ware made from clay and baked in a kiln | Synonyms: pottery |
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| clearance | (noun) permission to proceed | - |
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| (noun) the distance by which one thing clears another; the space between them | - |
| (noun) vertical space available to allow easy passage under something | Synonyms: headroom, headway |
| cleavage | (noun) the act of cleaving or splitting | - |
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| (noun) the line formed by a groove between two parts (especially the separation between a woman's breasts) | - |
| (noun) (embryology) the repeated division of a fertilised ovum | Synonyms: segmentation |
| (noun) the breaking of a chemical bond in a molecule resulting in smaller molecules | - |
| (noun) the state of being split or cleft | - |
| clementine | (noun) a mandarin orange of a deep reddish orange color and few seeds | - |
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| (noun) a variety of mandarin orange that is grown around the Mediterranean and in South Africa | Synonyms: clementine tree |
| cleome | (noun) any of various often strong-smelling plants of the genus Cleome having showy spider-shaped flowers | Synonyms: spiderflower |
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| cliche | (noun) a trite or obvious remark | Synonyms: banality, bromide, commonplace, platitude |
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| clientage | (noun) relation of a client to a patron | - |
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| clientele | (noun) customers collectively | Synonyms: business, patronage |
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| climate | (noun) the weather in some location averaged over some long period of time | Synonyms: clime |
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| (noun) the prevailing psychological state | Synonyms: mood |
| clime | (noun) the weather in some location averaged over some long period of time | Synonyms: climate |
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| clingstone | (noun) fruit (especially peach) whose flesh adheres strongly to the pit | Synonyms: cling |
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| clique | (noun) an exclusive circle of people with a common purpose | Synonyms: camp, coterie, ingroup, inner circle, pack |
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| cloche | (noun) a woman's close-fitting hat that resembles a helmet | - |
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| (noun) a low transparent cover put over young plants to protect them from cold | - |
| clofibrate | (noun) a drug (trade name Atromid-S) that reduces lipids in the blood serum; used to treat some cardiovascular diseases | Synonyms: Atromid-S |
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| cloisonne | (noun) enamelware in which colored areas are separated by thin metal strips | - |
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| clomiphene | (noun) a fertility drug (trade name Clomid) that is used to stimulate ovulation and that has been associated with multiple births | Synonyms: Clomid, clomiphene citrate |
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| clomipramine | (noun) a tricyclic antidepressant drug | - |
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| clone | (noun) an unauthorized copy or imitation | Synonyms: knockoff |
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| (noun) a group of genetically identical cells or organisms derived from a single cell or individual by some kind of asexual reproduction | Synonyms: clon |
| (noun) a person who is almost identical to another | Synonyms: dead ringer, ringer |
| clonidine | (noun) an antihypertensive (trade name Catapres) that can be administered orally or via transdermal patches | Synonyms: Catapres |
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| close | (noun) the concluding part of any performance | Synonyms: closing curtain, finale, finis |
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| (noun) the last section of a communication | Synonyms: closing, conclusion, end, ending |
| (noun) the temporal end; the concluding time | Synonyms: conclusion, finale, finis, finish, last, stopping point |
| closure | (noun) termination of operations | Synonyms: closedown, closing, shutdown |
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| (noun) the act of blocking | Synonyms: blockage, occlusion |
| (noun) approaching a particular destination; a coming closer; a narrowing of a gap | Synonyms: closing |
| (noun) an obstruction in a pipe or tube | Synonyms: block, blockage, occlusion, stop, stoppage |
| (noun) a Gestalt principle of organization holding that there is an innate tendency to perceive incomplete objects as complete and to close or fill gaps and to perceive asymmetric stimuli as symmetric | Synonyms: law of closure |
| (noun) something settled or resolved; the outcome of decision making | Synonyms: resolution, settlement |
| (noun) a rule for limiting or ending debate in a deliberative body | Synonyms: cloture, gag law, gag rule |
| clotheshorse | (noun) a framework on which to hang clothes (as for drying) | - |
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| (noun) a man who is much concerned with his dress and appearance | Synonyms: beau, dandy, dude, fashion plate, fop, gallant, sheik, swell |
| clothesline | (noun) a cord on which clothes are hung to dry | - |
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| cloture | (noun) a rule for limiting or ending debate in a deliberative body | Synonyms: closure, gag law, gag rule |
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| clove | (noun) spice from dried unopened flower bud of the clove tree; used whole or ground | - |
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| (noun) one of the small bulblets that can be split off of the axis of a larger garlic bulb | Synonyms: garlic clove |
| (noun) moderate sized very symmetrical red-flowered evergreen widely cultivated in the tropics for its flower buds which are source of cloves | Synonyms: clove tree, Eugenia aromaticum, Eugenia caryophyllatum, Syzygium aromaticum |
| (noun) aromatic flower bud of a clove tree; yields a spice | - |
| clozapine | (noun) an antipsychotic drug (trade name Clozaril) used as a sedative and for treatment-resistant schizophrenia; known to have few side effects | Synonyms: Clozaril |
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| clubhouse | (noun) a building that is occupied by a social club | Synonyms: club |
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| clue | (noun) a slight indication | Synonyms: hint |
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| (noun) evidence that helps to solve a problem | Synonyms: clew, cue |
| coagulase | (noun) an enzyme that induces coagulation | - |
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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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| coalface | (noun) the part of a coal seam that is being cut | - |
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| coalhole | (noun) a bin for holding coal | Synonyms: coalbin |
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| coastline | (noun) the outline of a coast | - |
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| coatee | (noun) a short close-fitting coat | - |
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| cobaltite | (noun) a rare silvery-white mineral; important ore of cobalt | - |
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| cobble | (noun) rectangular paving stone with curved top; once used to make roads | Synonyms: cobblestone, sett |
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| cobblestone | (noun) rectangular paving stone with curved top; once used to make roads | Synonyms: cobble, sett |
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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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| cockade | (noun) an ornament (such as a knot of ribbon or a rosette) usually worn on the hat | - |
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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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| cockhorse | (noun) anything used as a toy horse (such as a rocking horse or one knee of an adult) | - |
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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 | - |
| 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 |
| 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 |
| code | (noun) a coding system used for transmitting messages requiring brevity or secrecy | - |
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| (noun) a set of rules or principles or laws (especially written ones) | Synonyms: codification |
| (noun) (computer science) the symbolic arrangement of data or instructions in a computer program or the set of such instructions | Synonyms: computer code |
| (noun) a series of letters, numbers or symbols assigned to something for the purpose of classification or identification | - |
| codeine | (noun) derivative of opium; used as an antitussive (to relieve coughing) and an analgesic (to relieve pain) | - |
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| codpiece | (noun) (15th-16th century) a flap for the crotch of men's tight-fitting breeches | - |
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| coelenterate | (noun) radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms | Synonyms: cnidarian |
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| coelogyne | (noun) any of various orchids of the genus Coelogyne with: clusters of fragrant lacy snow-white flowers; salmon-pink solitary flowers; chainlike racemes of topaz and chocolate brown flowers; spikes of delicate white spice-scented flowers; emerald green flowers marked with blue-black | - |
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| coenobite | (noun) a member of a religious order living in common | Synonyms: cenobite |
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| coenzyme | (noun) a small molecule (not a protein but sometimes a vitamin) essential for the activity of some enzymes | - |
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| coexistence | (noun) existing peacefully together | - |
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| coffee | (noun) a medium brown to dark-brown color | Synonyms: burnt umber, chocolate, deep brown, umber |
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| (noun) a beverage consisting of an infusion of ground coffee beans | Synonyms: java |
| (noun) a seed of the coffee tree; ground to make coffee | Synonyms: coffee bean, coffee berry |
| (noun) any of several small trees and shrubs native to the tropical Old World yielding coffee beans | Synonyms: coffee tree |
| coffeecake | (noun) a cake or sweet bread usually served with coffee | Synonyms: coffee cake |
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| coffeehouse | (noun) a small restaurant where drinks and snacks are sold | Synonyms: cafe, coffee bar, coffee shop |
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| cognate | (noun) a word is cognate with another if both derive from the same word in an ancestral language | Synonyms: cognate word |
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| (noun) one related by blood or origin; especially on sharing an ancestor with another | Synonyms: blood relation, blood relative, sib |
| cognisance | (noun) having knowledge of | Synonyms: awareness, cognizance, consciousness, knowingness |
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| cognizance | (noun) having knowledge of | Synonyms: awareness, cognisance, consciousness, knowingness |
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| (noun) range of what one can know or understand | Synonyms: ken |
| (noun) range or scope of what is perceived | - |
| cognoscente | (noun) an expert able to appreciate a field; especially in the fine arts | Synonyms: connoisseur |
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| coherence | (noun) logical and orderly and consistent relation of parts | Synonyms: coherency |
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| (noun) the state of cohering or sticking together | Synonyms: coherency, cohesion, cohesiveness |
| cohoe | (noun) small salmon of northern Pacific coasts and the Great Lakes | Synonyms: blue jack, coho, coho salmon, Oncorhynchus kisutch, silver salmon |
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| (noun) fatty pinkish flesh of small salmon caught in the Pacific and Great Lakes | Synonyms: coho, coho salmon, silver salmon |
| cohune | (noun) tropical American feather palm whose large nuts yield valuable oil and a kind of vegetable ivory | Synonyms: cohune palm, Orbignya cohune |
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| coiffeuse | (noun) a woman hairdresser | - |
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| coiffure | (noun) the arrangement of the hair (especially a woman's hair) | Synonyms: coif, hair style, hairdo, hairstyle |
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| coigne | (noun) the keystone of an arch | Synonyms: coign, quoin |
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| (noun) expandable metal or wooden wedge used by printers to lock up a form within a chase | Synonyms: coign, quoin |
| coinage | (noun) the act of inventing a word or phrase | Synonyms: neologism, neology |
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| (noun) a newly invented word or phrase | Synonyms: neologism, neology |
| (noun) coins collectively | Synonyms: metal money, mintage, specie |
| coincidence | (noun) the temporal property of two things happening at the same time | Synonyms: co-occurrence, concurrence, conjunction |
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| (noun) the quality of occupying the same position or area in space | - |
| (noun) an event that might have been arranged although it was really accidental | Synonyms: happenstance |
| coinsurance | (noun) insurance issued jointly by two or more underwriters | - |
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| coke | (noun) street names for cocaine | Synonyms: blow, C, nose candy, snow |
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| (noun) carbon fuel produced by distillation of coal | - |
| colchicine | (noun) an analgesic drug derived from the saffron plant and used to treat gout | - |
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| cole | (noun) coarse curly-leafed cabbage | Synonyms: kail, kale |
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| (noun) a hardy cabbage with coarse curly leaves that do not form a head | Synonyms: borecole, Brassica oleracea acephala, colewort, kail, kale |
| coliphage | (noun) a bacteriophage that infects the bacterium Escherichia coli | - |
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| collage | (noun) a paste-up made by sticking together pieces of paper or photographs to form an artistic image | Synonyms: montage |
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| (noun) any collection of diverse things | - |
| collagenase | (noun) any enzyme that catalyzes the hydrolysis of collagen and gelatin | - |
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| collapse | (noun) the act of throwing yourself down; collapse; sink | Synonyms: flop |
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| (noun) a natural event caused by something suddenly falling down or caving in | - |
| (noun) a sudden large decline of business or the prices of stocks (especially one that causes additional failures) | Synonyms: crash |
| (noun) an abrupt failure of function or complete physical exhaustion | Synonyms: prostration |