| caesium | (noun) a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal | Synonyms: atomic number 55, cesium, Cs |
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| caladium | (noun) any plant of the genus Caladium cultivated for their ornamental foliage variously patterned in white or pink or red | - |
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| calcium | (noun) a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals | Synonyms: atomic number 20, Ca |
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| californium | (noun) a radioactive transuranic element; discovered by bombarding curium with alpha particles | Synonyms: atomic number 98, Cf |
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| callathump | (noun) a noisy mock serenade (made by banging pans and kettles) to a newly married couple | Synonyms: belling, callithump, charivari, chivaree, shivaree |
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| (noun) a noisy boisterous parade | Synonyms: callithump, callithump parade |
| callithump | (noun) a noisy mock serenade (made by banging pans and kettles) to a newly married couple | Synonyms: belling, callathump, charivari, chivaree, shivaree |
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| (noun) a noisy boisterous parade | Synonyms: callathump, callithump parade |
| calumet | (noun) a highly decorated ceremonial pipe of Amerindians; smoked on ceremonial occasions (especially as a token of peace) | Synonyms: peace pipe, pipe of peace |
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| calumniation | (noun) a false accusation of an offense or a malicious misrepresentation of someone's words or actions | Synonyms: calumny, defamation, hatchet job, obloquy, traducement |
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| calumny | (noun) an abusive attack on a person's character or good name | Synonyms: aspersion, defamation, denigration, slander |
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| (noun) a false accusation of an offense or a malicious misrepresentation of someone's words or actions | Synonyms: calumniation, defamation, hatchet job, obloquy, traducement |
| cambium | (noun) the inner layer of the periosteum | - |
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| (noun) a formative one-cell layer of tissue between xylem and phloem in most vascular plants that is responsible for secondary growth | - |
| candelabrum | (noun) branched candlestick; ornamental; has several lights | Synonyms: candelabra |
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| capitulum | (noun) a dense cluster of flowers or foliage | Synonyms: head |
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| (noun) fruiting spike of a cereal plant especially corn | Synonyms: ear, spike |
| (noun) an arrangement of leafy branches forming the top or head of a tree | - |
| capsicum | (noun) any of various tropical plants of the genus Capsicum bearing peppers | Synonyms: capsicum pepper plant, pepper |
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| carborundum | (noun) an abrasive composed of silicon carbide crystals | - |
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| cardamum | (noun) aromatic seeds used as seasoning like cinnamon and cloves especially in pickles and barbecue sauces | Synonyms: cardamom, cardamon |
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| catechumen | (noun) a new convert being taught the principles of Christianity by a catechist | Synonyms: neophyte |
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| cavum | (noun) (anatomy) a natural hollow or sinus within the body | Synonyms: bodily cavity, cavity |
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| cecum | (noun) the cavity in which the large intestine begins and into which the ileum opens | Synonyms: blind gut, caecum |
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| cementum | (noun) a specialized bony substance covering the root of a tooth | Synonyms: cement |
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| centrum | (noun) the main body of a vertebra | - |
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| cerebellum | (noun) a major division of the vertebrate brain; situated above the medulla oblongata and beneath the cerebrum in humans | - |
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| cerebrum | (noun) anterior portion of the brain consisting of two hemispheres; dominant part of the brain in humans | - |
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| cerium | (noun) a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group | Synonyms: atomic number 58, Ce |
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| cerumen | (noun) a soft yellow wax secreted by glands in the ear canal | Synonyms: earwax |
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| cesium | (noun) a soft silver-white ductile metallic element (liquid at normal temperatures); the most electropositive and alkaline metal | Synonyms: atomic number 55, caesium, Cs |
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| checksum | (noun) a digit representing the sum of the digits in an instance of digital data; used to check whether errors have occurred in transmission or storage | - |
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| chemiluminescence | (noun) luminescence resulting from a chemical reaction as the oxidation of luciferin in fireflies | - |
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| chetrum | (noun) 100 chetrums equal 1 ngultrum in Bhutan | - |
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| chromium | (noun) a hard brittle multivalent metallic element; resistant to corrosion and tarnishing | Synonyms: atomic number 24, Cr |
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| chrysanthemum | (noun) any of numerous perennial Old World herbs having showy brightly colored flower heads of the genera Chrysanthemum, Argyranthemum, Dendranthema, Tanacetum; widely cultivated | - |
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| (noun) the flower of a chrysanthemum plant | - |
| chum | (noun) a large Pacific salmon with small spots on its back; an important food fish | Synonyms: chum salmon, Oncorhynchus keta |
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| (noun) bait consisting of chopped fish and fish oils that are dumped overboard to attract fish | - |
| (noun) a close friend who accompanies his buddies in their activities | Synonyms: brother, buddy, crony, pal, sidekick |
| chumminess | (noun) the quality of affording easy familiarity and sociability | Synonyms: camaraderie, comradeliness, comradery, comradeship |
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| chump | (noun) a person who is gullible and easy to take advantage of | Synonyms: fall guy, fool, gull, mark, mug, patsy, soft touch, sucker |
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| cilium | (noun) a hairlike projection from the surface of a cell; provides locomotion in free-swimming unicellular organisms | - |
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| (noun) any of the short curved hairs that grow from the edges of the eyelids | Synonyms: eyelash, lash |
| cinerarium | (noun) a niche for a funeral urn containing the ashes of the cremated dead | Synonyms: columbarium |
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| cingulum | (noun) (anatomy) an encircling structure (as the ridge around the base of a tooth) | - |
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| circumcision | (noun) the act of circumcising; surgical removal of the foreskin of males | - |
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| (noun) the act of circumcising performed on males eight days after birth as a Jewish and Muslim religious rite | - |
| circumduction | (noun) a circular movement of a limb or eye | - |
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| 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 |
| circumflex | (noun) a diacritical mark (^) placed above a vowel in some languages to indicate a special phonetic quality | - |
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| circumlocution | (noun) a style that involves indirect ways of expressing things | Synonyms: ambage, periphrasis |
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| (noun) an indirect way of expressing something | Synonyms: indirect expression |
| circumnavigation | (noun) traveling around something (by ship or plane) | - |
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| circumscription | (noun) the act of circumscribing | - |
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| circumspection | (noun) the trait of being circumspect and prudent | Synonyms: caution |
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| (noun) knowing how to avoid embarrassment or distress | Synonyms: discreetness, discretion, prudence |
| 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 |
| circumstances | (noun) a person's financial situation (good or bad) | - |
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| (noun) your overall circumstances or condition in life (including everything that happens to you) | Synonyms: destiny, fate, fortune, lot, luck, portion |
| circumvention | (noun) the act of evading by going around | - |
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| circumvolution | (noun) the act of turning or winding or folding around a central axis | - |
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| cirrocumulus | (noun) a cloud at a high altitude consisting of a series of regularly arranged small clouds resembling ripples | Synonyms: cirrocumulus cloud |
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| claustrum | (noun) a layer of grey matter in the brain adjacent to the lenticular nucleus | - |
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| cleistothecium | (noun) closed spore-bearing structure of some fungi (especially Aspergillaceae and Erysiphaceae) from which spores are released only by decay or disintegration | Synonyms: cleistocarp |
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| clostridium | (noun) spindle-shaped bacterial cell especially one swollen at the center by an endospore | Synonyms: clostridia |
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| clumber | (noun) a thickset spaniel with longish silky hair | Synonyms: clumber spaniel |
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| clump | (noun) a heavy dull sound (as made by impact of heavy objects) | Synonyms: clunk, thud, thump, thumping |
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| (noun) a grouping of a number of similar things | Synonyms: bunch, cluster, clustering |
| (noun) a compact mass | Synonyms: ball, chunk, clod, glob, lump |
| clumping | (noun) the sound of a horse's hoofs hitting on a hard surface | Synonyms: clip-clop, clippety-clop, clop, clopping, clunking |
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| clumsiness | (noun) the carriage of someone whose movements and posture are ungainly or inelegant | Synonyms: awkwardness |
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| (noun) the inelegance of someone stiff and unrelaxed (as by embarrassment) | Synonyms: awkwardness, gracelessness, stiffness |
| (noun) unskillfulness resulting from a lack of training | Synonyms: awkwardness, ineptitude, ineptness, maladroitness, slowness |
| coagulum | (noun) a lump of material formed from the content of a liquid | Synonyms: clot |
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| coccidium | (noun) parasitic on the digestive epithelium of vertebrates and higher invertebrates | Synonyms: eimeria |
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| coliseum | (noun) an oval large stadium with tiers of seats; an arena in which contests and spectacles are held | Synonyms: amphitheater, amphitheatre |
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| colloquium | (noun) an address to an academic meeting or seminar | - |
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| (noun) an academic meeting or seminar usually led by a different lecturer and on a different topic at each meeting | - |
| collyrium | (noun) lotion consisting of a solution used as a cleanser for the eyes | Synonyms: eye-lotion, eyewash |
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| colostrum | (noun) milky fluid secreted for the first day or two after parturition | Synonyms: foremilk |
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| columbarium | (noun) a sepulchral vault or other structure having recesses in the walls to receive cinerary urns | - |
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| (noun) a niche for a funeral urn containing the ashes of the cremated dead | Synonyms: cinerarium |
| (noun) a birdhouse for pigeons | Synonyms: columbary, dovecote |
| columbary | (noun) a birdhouse for pigeons | Synonyms: columbarium, dovecote |
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| columbine | (noun) a plant of the genus Aquilegia having irregular showy spurred flowers; north temperate regions especially mountains | Synonyms: aquilege, aquilegia |
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| columbite | (noun) a black mineral that is an ore of niobium and tantalum | Synonyms: niobite |
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| columbium | (noun) a former name for niobium | - |
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| columbo | (noun) any of various tall perennial herbs constituting the genus Frasera; widely distributed in warm dry upland areas of California, Oregon, and Washington | Synonyms: American columbo, American gentian, deer's-ear, deer's-ears, pyramid plant |
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| columella | (noun) a small column (or structure resembling a column) that is a part of a plant or animal | - |
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| column | (noun) (architecture) a tall vertical cylindrical structure standing upright and used to support a structure | Synonyms: pillar |
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| (noun) a vertical cylindrical structure standing alone and not supporting anything (such as a monument) | Synonyms: pillar |
| (noun) a vertical glass tube used in column chromatography; a mixture is poured in the top and washed through a stationary substance where components of the mixture are adsorbed selectively to form colored bands | Synonyms: chromatography column |
| (noun) any tubular or pillar-like supporting structure in the body | - |
| (noun) an article giving opinions or perspectives | Synonyms: editorial, newspaper column |
| (noun) a page or text that is vertically divided | - |
| (noun) a line of units following one after another | - |
| (noun) a vertical array of numbers or other information | - |
| (noun) anything that approximates the shape of a column or tower | Synonyms: pillar, tower |
| columnea | (noun) tropical plant having thick hairy somewhat toothed leaves and solitary or clustered yellow to scarlet flowers; many cultivated for their flowers and ornamental foliage | - |
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| columniation | (noun) (architecture) the arrangement of columns (especially freestanding columns) in a structure | - |
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| columnist | (noun) a journalist who writes editorials | Synonyms: editorialist |
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| combretum | (noun) any of numerous shrubs or small trees of the genus Combretum having spikes of small flowers | - |
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| compendium | (noun) a concise but comprehensive summary of a larger work | - |
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| (noun) a publication containing a variety of works | Synonyms: collection |
| condominium | (noun) housing consisting of a complex of dwelling units (as an apartment house) in which each unit is individually owned | - |
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| (noun) one of the dwelling units in a condominium | Synonyms: condo |
| conidium | (noun) an asexually produced fungal spore formed on a conidiophore | Synonyms: conidiospore |
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| consortium | (noun) an association of companies for some definite purpose | Synonyms: pool, syndicate |
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| consumer | (noun) a person who uses goods or services | - |
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| consumerism | (noun) a movement advocating greater protection of the interests of consumers | - |
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| (noun) the theory that an increasing consumption of goods is economically beneficial | - |
| consummation | (noun) the act of bringing to completion or fruition | - |
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| (noun) the completion of marriage by sexual intercourse | - |
| consumption | (noun) the act of consuming something | Synonyms: expenditure, using up |
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| (noun) the process of taking food into the body through the mouth (as by eating) | Synonyms: ingestion, intake, uptake |
| (noun) (economics) the utilization of economic goods to satisfy needs or in manufacturing | Synonyms: economic consumption, usance, use, use of goods and services |
| (noun) involving the lungs with progressive wasting of the body | Synonyms: phthisis, pulmonary tuberculosis, wasting disease, white plague |
| consumptive | (noun) a person with pulmonary tuberculosis | Synonyms: lunger, tubercular |
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| continuum | (noun) a continuous nonspatial whole or extent or succession in which no part or portion is distinct or distinguishable from adjacent parts | - |
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| contumacy | (noun) willful refusal to appear before a court or comply with a court order; can result in a finding of contempt of court | - |
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| (noun) obstinate rebelliousness and insubordination; resistance to authority | - |
| contumely | (noun) a rude expression intended to offend or hurt | Synonyms: abuse, insult, revilement, vilification |
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| conundrum | (noun) a difficult problem | Synonyms: brain-teaser, enigma, riddle |
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| corium | (noun) the deep vascular inner layer of the skin | Synonyms: derma, dermis |
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| corneum | (noun) the outermost layer of the epidermis consisting of dead cells that slough off | Synonyms: horny layer, stratum corneum |
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| corrigendum | (noun) a printer's error; to be corrected | - |
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| corundum | (noun) very hard mineral used as an abrasive | Synonyms: corundom |
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| corynebacterium | (noun) any species of the genus Corynebacterium | - |
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| costume | (noun) the attire worn in a play or at a fancy dress ball | - |
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| (noun) the attire characteristic of a country or a time or a social class | - |
| (noun) unusual or period attire not characteristic of or appropriate to the time and place | - |
| (noun) the prevalent fashion of dress (including accessories and hair style as well as garments) | - |
| costumer | (noun) someone who designs or supplies costumes (as for a play or masquerade) | Synonyms: costume designer, costumier |
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| costumier | (noun) someone who designs or supplies costumes (as for a play or masquerade) | Synonyms: costume designer, costumer |
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| coumarone | (noun) a colorless oily compound extracted from coal tar and used in manufacturing synthetic resins | Synonyms: benzofuran, cumarone |
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| counterargument | (noun) an argument offered in opposition to another argument | - |
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| cranium | (noun) the part of the skull that encloses the brain | Synonyms: braincase, brainpan |
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| credendum | (noun) (Christianity) any of the sections into which a creed or other statement of doctrine is divided | Synonyms: article of faith |
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| crematorium | (noun) a furnace where a corpse can be burned and reduced to ashes | Synonyms: cremation chamber, crematory |
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| (noun) a mortuary where corpses are cremated | Synonyms: crematory |