| chroma | (noun) chromatic purity: freedom from dilution with white and hence vivid in hue | Synonyms: intensity, saturation, vividness |
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| chromaesthesia | (noun) a form of synesthesia in which nonvisual stimulation results in the experience of color sensations | Synonyms: chromesthesia |
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| chromesthesia | (noun) a form of synesthesia in which nonvisual stimulation results in the experience of color sensations | Synonyms: chromaesthesia |
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| chuckwalla | (noun) a herbivorous lizard that lives among rocks in the arid parts of southwestern United States and Mexico | Synonyms: Sauromalus obesus |
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| chufa | (noun) European sedge having small edible nutlike tubers | Synonyms: Cyperus esculentus, earth almond, ground almond, rush nut, yellow nutgrass |
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| chukka | (noun) a shoe that comes up to the ankle and is laced through two or three pairs of eyelets; often made of suede | Synonyms: chukka boot |
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| (noun) (polo) one of six divisions into which a polo match is divided | Synonyms: chukker |
| chunga | (noun) Argentinian Cariama | Synonyms: Chunga burmeisteri, seriema |
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| chutzpa | (noun) (Yiddish) unbelievable gall; insolence; audacity | Synonyms: chutzpah, hutzpah |
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| chyloderma | (noun) swelling of the scrotum resulting from chronic lymphatic obstruction | Synonyms: elephantiasis scroti |
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| cicada | (noun) stout-bodied insect with large membranous wings; male has drum-like organs for producing a high-pitched drone | Synonyms: cicala |
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| cicala | (noun) stout-bodied insect with large membranous wings; male has drum-like organs for producing a high-pitched drone | Synonyms: cicada |
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| cinchona | (noun) any of several trees of the genus Cinchona | Synonyms: chinchona |
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| (noun) medicinal bark of cinchona trees; source of quinine and quinidine | Synonyms: cinchona bark, Jesuit's bark, Peruvian bark |
| cinema | (noun) a theater where films are shown | Synonyms: movie house, movie theater, movie theatre, picture palace |
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| (noun) a medium that disseminates moving pictures | Synonyms: celluloid, film |
| cineraria | (noun) herb of Canary Islands widely cultivated for its blue or purple or red or variegated daisylike flowers | Synonyms: Pericallis cruenta, Senecio cruentus |
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| cisterna | (noun) a sac or cavity containing fluid especially lymph or cerebrospinal fluid | Synonyms: cistern |
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| claustrophobia | (noun) a morbid fear of being closed in a confined space | - |
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| clepsydra | (noun) clock that measures time by the escape of water | Synonyms: water clock, water glass |
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| clintonia | (noun) any temperate liliaceous plant of the genus Clintonia having broad basal leaves and white or yellowish or purplish flowers followed by blue or black berries | Synonyms: Clinton's lily |
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| cloaca | (noun) a waste pipe that carries away sewage or surface water | Synonyms: sewer, sewerage |
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| (noun) (zoology) the cavity (in birds, reptiles, amphibians, most fish, and monotremes but not other mammals) at the end of the digestive tract into which the intestinal, genital, and urinary tracts open | - |
| clostridia | (noun) spindle-shaped bacterial cell especially one swollen at the center by an endospore | Synonyms: clostridium |
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| clusia | (noun) an aromatic tree of the genus Clusia having large white or yellow or pink flowers | - |
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| cobia | (noun) large dark-striped tropical food and game fish related to remoras; found worldwide in coastal to open waters | Synonyms: Rachycentron canadum, sergeant fish |
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| cobra | (noun) venomous Asiatic and African elapid snakes that can expand the skin of the neck into a hood | - |
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| 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 |
| 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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| 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 |
| coda | (noun) the closing section of a musical composition | Synonyms: finale |
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| cola | (noun) carbonated drink flavored with extract from kola nuts | Synonyms: dope |
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| coloratura | (noun) singing with florid ornamentation | - |
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| (noun) a lyric soprano who specializes in coloratura vocal music | Synonyms: coloratura soprano |
| columella | (noun) a small column (or structure resembling a column) that is a part of a plant or animal | - |
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| 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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| colza | (noun) Eurasian plant cultivated for its seed and as a forage crop | Synonyms: Brassica napus, rape |
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| coma | (noun) a state of deep and often prolonged unconsciousness; usually the result of disease or injury | Synonyms: comatoseness |
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| (noun) (astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed | - |
| (noun) (botany) a usually terminal tuft of bracts (as in the pineapple) or tuft of hairs (especially on certain seeds) | - |
| comma | (noun) anglewing butterfly with a comma-shaped mark on the underside of each hind wing | Synonyms: comma butterfly, Polygonia comma |
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| (noun) a punctuation mark (,) used to indicate the separation of elements within the grammatical structure of a sentence | - |
| commelina | (noun) any plant of the genus Commelina | - |
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| concertina | (noun) free-reed instrument played like an accordion by pushing its ends together to force air through the reeds | - |
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| (noun) coiled barbed wire used as an obstacle | - |
| (verb) collapse like a concertina | - |
| concha | (noun) (anatomy) a structure that resembles a shell in shape | - |
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| conferva | (noun) any of various algae of the genus Tribonema; algae with branching filaments that form scum in still or stagnant fresh water | - |
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| conga | (noun) a Latin American dance of 3 steps and a kick by people in single file | - |
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| (noun) music composed for dancing the conga | - |
| (verb) dance the conga | - |
| conima | (noun) a gum resin from the poison hemlock, Conium maculatum | - |
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| conjunctiva | (noun) a transparent lubricating mucous membrane that covers the eyeball and the under surface of the eyelid | - |
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| copaiba | (noun) an oleoresin used in varnishes and ointments | Synonyms: balsam capivi, copaiba balsam |
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| copra | (noun) the dried meat of the coconut from which oil is extracted | - |
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| coprolalia | (noun) an uncontrollable use of obscene language; often accompanied by mental disorders | - |
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| coprophagia | (noun) eating feces; in human a symptom of some kinds of insanity | Synonyms: coprophagy |
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| copula | (noun) an equating verb (such as `be' or `become') that links the subject with the complement of a sentence | Synonyms: copulative, linking verb |
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| corbina | (noun) bluish-grey whiting of California coast | Synonyms: Menticirrhus undulatus |
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| cordoba | (noun) the basic unit of money in Nicaragua; equal to 100 centavos | - |
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| cornea | (noun) the transparent dome-shaped anterior portion of the outer covering of the eye; it covers the iris and pupil and is continuous with the sclera | - |
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| cornucopia | (noun) the property of being extremely abundant | Synonyms: profuseness, profusion, richness |
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| (noun) a goat's horn filled with grain and flowers and fruit symbolizing prosperity | Synonyms: horn of plenty |
| corolla | (noun) (botany) the whorl of petals of a flower that collectively form an inner floral envelope or layer of the perianth | - |
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| corona | (noun) a long cigar with blunt ends | - |
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| (noun) (anatomy) any structure that resembles a crown in shape | - |
| (noun) the outermost region of the sun's atmosphere; visible as a white halo during a solar eclipse | Synonyms: aureole |
| (noun) an electrical discharge accompanied by ionization of surrounding atmosphere | Synonyms: corona discharge, corposant, electric glow, Saint Elmo's fire, Saint Elmo's light, Saint Ulmo's fire, Saint Ulmo's light, St. Elmo's fire |
| (noun) one or more circles of light seen around a luminous object | - |
| (noun) (botany) the trumpet-shaped or cup-shaped outgrowth of the corolla of a daffodil or narcissus flower | - |
| (noun) a viral disease caused by SARS-CoV-2 that caused a global pandemic in 2020 | Synonyms: 2019-nCoV acute respiratory disease, coronavirus, coronavirus disease 2019, COVID-19, novel coronavirus pneumonia, Wuhan coronavirus, Wuhan flu, Wuhan pneumonia, Wuhan virus |
| coronilla | (noun) any of various plants of the genus Coronilla having purple or pink or yellow flowers in long axillary heads or umbels | - |
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| corrida | (noun) a Spanish or Portuguese or Latin American spectacle; a matador baits and (usually) kills a bull in an arena before many spectators | Synonyms: bullfight |
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| corrigenda | (noun) a list of printing errors in a book along with their corrections | - |
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| cortina | (noun) a cobwebby partial veil consisting of silky fibrils | - |
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| coryphantha | (noun) a cactus of the genus Coryphantha | - |
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| coryza | (noun) an inflammation of the mucous membrane lining the nose (usually associated with nasal discharge) | Synonyms: rhinitis |
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| coscoroba | (noun) large white South American bird intermediate in some respects between ducks and swans | - |
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| cosmea | (noun) any of various mostly Mexican herbs of the genus Cosmos having radiate heads of variously colored flowers and pinnate leaves; popular fall-blooming annuals | Synonyms: cosmos |
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| costa | (noun) any of the 12 pairs of curved arches of bone extending from the spine to or toward the sternum in humans (and similar bones in most vertebrates) | Synonyms: rib |
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| (noun) a riblike part of a plant or animal (such as a middle rib of a leaf or a thickened vein of an insect wing) | - |
| costalgia | (noun) pain in the chest caused by inflammation of the muscles between the ribs | Synonyms: pleuralgia, pleurodynia |
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| costia | (noun) a flagellate that is the cause of the frequently fatal fish disease costiasis | Synonyms: Costia necatrix |
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| cotinga | (noun) passerine bird of New World tropics | Synonyms: chatterer |
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| counterplea | (noun) a plaintiff's reply to a defendant's plea | - |
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| cowpea | (noun) eaten fresh as shell beans or dried | Synonyms: black-eyed pea |
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| (noun) sprawling Old World annual cultivated especially in southern United States for food and forage and green manure | Synonyms: black-eyed pea, cowpea plant, Vigna sinensis, Vigna unguiculata |
| (noun) fruit or seed of the cowpea plant | Synonyms: black-eyed pea |
| coxa | (noun) the ball-and-socket joint between the head of the femur and the acetabulum | Synonyms: articulatio coxae, hip, hip joint |
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| credenza | (noun) a kind of sideboard or buffet | Synonyms: credence |
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| crotalaria | (noun) any of various plants of the genus Crotalaria having inflated pods within which the seeds rattle; used for pasture and green-manure crops | Synonyms: rattlebox |
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| cryaesthesia | (noun) hypersensitivity to cold | Synonyms: cryesthesia |
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| cryesthesia | (noun) hypersensitivity to cold | Synonyms: cryaesthesia |
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| cryoanaesthesia | (noun) insensibility resulting from cold | Synonyms: cryoanesthesia |
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| cryoanesthesia | (noun) insensibility resulting from cold | Synonyms: cryoanaesthesia |
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| cryophobia | (noun) a morbid fear of freezing | - |
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| cupola | (noun) a roof in the form of a dome | - |
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| (noun) a vertical cylindrical furnace for melting iron for casting | - |
| cuppa | (noun) a cup of tea | Synonyms: cupper |
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| curacoa | (noun) flavored with sour orange peel | Synonyms: curacao |
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| curandera | (noun) a Mexican woman who practices healing techniques inherited from the Mayans | - |
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| curiosa | (noun) books on strange or unusual subjects (especially erotica) | - |
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| cuticula | (noun) the outer body wall of an insect | - |
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| cyanobacteria | (noun) predominantly photosynthetic prokaryotic organisms containing a blue pigment in addition to chlorophyll; occur singly or in colonies in diverse habitats; important as phytoplankton | Synonyms: blue-green algae |
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| cyberphobia | (noun) irrational fear of computers or technology | - |
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| cyclopaedia | (noun) a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty | Synonyms: cyclopedia, encyclopaedia, encyclopedia |
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| cyclopedia | (noun) a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty | Synonyms: cyclopaedia, encyclopaedia, encyclopedia |
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| cyclopia | (noun) a developmental abnormality in which there is only one eye | - |
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| cyclorama | (noun) a picture (or series of pictures) representing a continuous scene | Synonyms: diorama, panorama |
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| cyclothymia | (noun) a mild bipolar disorder that persists over a long time | Synonyms: cyclic disorder, cyclothymic disorder |
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| cyma | (noun) (architecture) a molding for a cornice; in profile it is shaped like an S (partly concave and partly convex) | Synonyms: cymatium |
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| cynophobia | (noun) a morbid fear of dogs | - |
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| cypripedia | (noun) a plant or flower of the genus Cypripedium | - |
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| cyrilla | (noun) shrub or small tree of southeastern United States to West Indies and Brazil; grown for the slender racemes of white flowers and orange and crimson foliage | Synonyms: Cyrilla racemiflora, leatherwood, white titi |
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| cystoplegia | (noun) paralysis of the urinary bladder | Synonyms: cystoparalysis |
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| cytopenia | (noun) a deficiency of some cellular element of the blood | - |
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| czarina | (noun) the wife or widow of a czar | Synonyms: czaritza, tsarina, tsaritsa, tzarina |
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| czaritza | (noun) the wife or widow of a czar | Synonyms: czarina, tsarina, tsaritsa, tzarina |
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| dacha | (noun) Russian country house | - |
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| dada | (noun) a nihilistic art movement (especially in painting) that flourished in Europe early in the 20th century; based on irrationality and negation of the accepted laws of beauty | Synonyms: dadaism |
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| (noun) an informal term for a father; probably derived from baby talk | Synonyms: dad, daddy, pa, papa, pappa, pop |
| dagga | (noun) relatively nontoxic South African herb smoked like tobacco | Synonyms: Cape dagga, Leonotis leonurus, red dagga, wilde dagga |
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| dahlia | (noun) any of several plants of or developed from the species Dahlia pinnata having tuberous roots and showy rayed variously colored flower heads; native to the mountains of Mexico and Central America and Colombia | Synonyms: Dahlia pinnata |
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| daphnia | (noun) minute freshwater crustacean having a round body enclosed in a transparent shell; moves about like a flea by means of hairy branched antennae | Synonyms: water flea |
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