| calamity | (noun) an event resulting in great loss and misfortune | Synonyms: cataclysm, catastrophe, disaster, tragedy |
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| calamondin | (noun) a fruit of the calamondin tree. | - |
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| calamus | (noun) the hollow spine of a feather | Synonyms: quill, shaft |
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| (noun) any tropical Asian palm of the genus Calamus; light tough stems are a source of rattan canes | - |
| (noun) perennial marsh plant having swordlike leaves and aromatic roots | Synonyms: Acorus calamus, flagroot, myrtle flag, sweet calamus, sweet flag |
| (noun) the aromatic root of the sweet flag used medicinally | - |
| calanthe | (noun) any of various showy orchids of the genus Calanthe having white or yellow or rose-colored flowers and broad leaves folded lengthwise | - |
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| calash | (noun) the folding hood of a horse-drawn carriage | Synonyms: calash top, caleche |
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| (noun) a woman's large folded hooped hood; worn in the 18th century | Synonyms: caleche |
| calceolaria | (noun) any garden plant of the genus Calceolaria having flowers with large inflated slipper-shaped lower lip | Synonyms: slipperwort |
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| calculability | (noun) The quality of being subject to or ascertainable by calculation. | - |
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| calculation | (noun) the procedure of calculating; determining something by mathematical or logical methods | Synonyms: computation, computing |
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| (noun) problem solving that involves numbers or quantities | Synonyms: computation, figuring, reckoning |
| (noun) planning something carefully and intentionally | Synonyms: deliberation |
| calculator | (noun) a small machine that is used for mathematical calculations; can be mechanical or electronic | Synonyms: calculating machine |
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| (noun) an expert at calculation (or at operating calculating machines) | Synonyms: computer, estimator, figurer, reckoner |
| calendula | (noun) any of numerous chiefly annual herbs of the genus Calendula widely cultivated for their yellow or orange flowers; often used for medicinal and culinary purposes | - |
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| calla | (noun) South African plant widely cultivated for its showy pure white spathe and yellow spadix | Synonyms: arum lily, calla lily, Zantedeschia aethiopica |
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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 |
| camarilla | (noun) a clique (often secret) that seeks power usually through intrigue | Synonyms: cabal, faction, junto |
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| camouflage | (noun) the act of concealing the identity of something by modifying its appearance | Synonyms: disguise |
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| (noun) device or stratagem for concealment or deceit | - |
| (noun) fabric dyed with splotches of green and brown and black and tan; intended to make the wearer of a garment made of this fabric hard to distinguish from the background | Synonyms: camo |
| (noun) an outward semblance that misrepresents the true nature of something | Synonyms: disguise |
| campanula | (noun) any of various plants of the genus Campanula having blue or white bell-shaped flowers | Synonyms: bellflower |
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| canafistola | (noun) deciduous or semi-evergreen tree having scented sepia to yellow flowers in drooping racemes and pods whose pulp is used medicinally; tropical Asia and Central and South America and Australia | Synonyms: canafistula, Cassia fistula, drumstick tree, golden shower tree, pudding pipe tree, purging cassia |
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| canafistula | (noun) deciduous or semi-evergreen tree having scented sepia to yellow flowers in drooping racemes and pods whose pulp is used medicinally; tropical Asia and Central and South America and Australia | Synonyms: canafistola, Cassia fistula, drumstick tree, golden shower tree, pudding pipe tree, purging cassia |
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| cancellation | (noun) the act of cancelling; calling off some arrangement | - |
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| (noun) the speech act of revoking or annulling or making void | - |
| candela | (noun) the basic unit of luminous intensity adopted under the Systeme International d'Unites; equal to 1/60 of the luminous intensity per square centimeter of a black body radiating at the temperature of 2,046 degrees Kelvin | Synonyms: candle, cd, standard candle |
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| candelabra | (noun) branched candlestick; ornamental; has several lights | Synonyms: candelabrum |
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| candelabrum | (noun) branched candlestick; ornamental; has several lights | Synonyms: candelabra |
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| candelilla | (noun) wax-coated shrub of northern Mexico and southwestern United States | Synonyms: Euphorbia antisyphilitica |
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| (noun) wax-coated Mexican shrub related to Euphorbia antisyphilitica | Synonyms: Pedilanthus bracteatus, Pedilanthus pavonis |
| canella | (noun) highly aromatic inner bark of the Canella winterana used as a condiment and a tonic | Synonyms: canella bark, white cinnamon |
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| cannula | (noun) a small flexible tube inserted into a body cavity for draining off fluid or introducing medication | - |
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| cannulation | (noun) the insertion of a cannula or tube into a hollow body organ | Synonyms: cannulisation, cannulization, canulation, canulisation, canulization, intubation |
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| canola | (noun) vegetable oil made from rapeseed; it is high in monounsaturated fatty acids | Synonyms: canola oil |
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| cantala | (noun) Philippine plant yielding a hard fibre used in making coarse twine | Synonyms: Agave cantala, maguey |
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| (noun) hard fiber used in making coarse twine; from Philippine agave plants | Synonyms: Cebu maguey, manila maguey |
| cantillation | (noun) liturgical chanting | - |
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| canulation | (noun) the insertion of a cannula or tube into a hollow body organ | Synonyms: cannulation, cannulisation, cannulization, canulisation, canulization, intubation |
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| capelan | (noun) very small northern fish; forage for sea birds and marine mammals and other fishes | Synonyms: capelin, caplin |
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| capillarity | (noun) a phenomenon associated with surface tension and resulting in the elevation or depression of liquids in capillaries | Synonyms: capillary action |
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| capillary | (noun) a tube of small internal diameter; holds liquid by capillary action | Synonyms: capillary tube, capillary tubing |
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| (noun) any of the minute blood vessels connecting arterioles with venules | Synonyms: capillary vessel |
| capitula | (noun) a short scripture reading; done after a psalmody. | - |
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| capitulation | (noun) the act of surrendering (usually under agreed conditions) | Synonyms: fall, surrender |
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| (noun) a summary that enumerates the main parts of a topic | - |
| (noun) a document containing the terms of surrender | - |
| carambola | (noun) deeply ridged yellow-brown tropical fruit; used raw as a vegetable or in salad or when fully ripe as a dessert | Synonyms: star fruit |
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| (noun) East Indian tree bearing deeply ridged yellow-brown fruit | Synonyms: Averrhoa carambola, carambola tree |
| cardinalate | (noun) the office of cardinal | Synonyms: cardinalship |
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| (noun) (Roman Catholic Church) the body of all cardinals of the church; elects and advises the pope | Synonyms: College of Cardinals, Sacred College, Sacred College of Cardinals |
| cartilage | (noun) tough elastic tissue; mostly converted to bone in adults | Synonyms: gristle |
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| cartilaginification | (noun) abnormal formation of cartilage from other tissues; observed in some Asians | - |
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| caruncula | (noun) an outgrowth on a plant or animal such as a fowl's wattle or a protuberance near the hilum of certain seeds | Synonyms: caruncle |
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| cascarilla | (noun) West Indian shrub with aromatic bark | Synonyms: Croton eluteria |
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| catalase | (noun) enzyme found in most plant and animal cells that functions as an oxidative catalyst; decomposes hydrogen peroxide into oxygen and water | - |
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| cataplasia | (noun) (biology) degenerative reversion of cells or tissue to a less differentiated or more primitive form | - |
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| cataplasm | (noun) a medical dressing consisting of a soft heated mass of meal or clay that is spread on a cloth and applied to the skin to treat inflamed areas or improve circulation etc. | Synonyms: plaster, poultice |
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| catclaw | (noun) erect shrub with small if any spines having racemes of white to yellow flowers followed by curved pointed pods and black shiny seeds; West Indies and Florida | Synonyms: black bead, cat's-claw, Pithecellobium unguis-cati |
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| catecholamine | (noun) any of a group of chemicals including epinephrine and norepinephrine that are produced in the medulla of the adrenal gland | - |
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| caterpillar | (noun) a wormlike and often brightly colored and hairy or spiny larva of a butterfly or moth | - |
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| cavalla | (noun) large mackerel with long pointed snout; important food and game fish of the eastern Atlantic coast southward to Brazil | Synonyms: cero, king mackerel, Scomberomorus cavalla |
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| cedilla | (noun) a diacritical mark (,) placed below the letter c to indicate that it is pronounced as an s | - |
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| celandine | (noun) perennial herb with branched woody stock and bright yellow flowers | Synonyms: Chelidonium majus, greater celandine, swallow wort, swallowwort |
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| (noun) North American annual plant with usually yellow or orange flowers; grows chiefly on wet rather acid soil | Synonyms: Impatiens capensis, jewelweed, lady's earrings, orange balsam, touch-me-not |
| cellar | (noun) the lowermost portion of a structure partly or wholly below ground level; often used for storage | Synonyms: basement |
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| (noun) storage space where wines are stored | Synonyms: wine cellar |
| (noun) an excavation where root vegetables are stored | Synonyms: root cellar |
| cellarage | (noun) a storage area in a cellar | - |
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| (noun) a charge for storing goods in a cellar | - |
| cellaret | (noun) sideboard with compartments for holding bottles | Synonyms: minibar |
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| cellularity | (noun) the state of having cells | - |
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| cephalalgia | (noun) pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs | Synonyms: head ache, headache |
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| cephalaspid | (noun) extinct jawless fish of the Devonian with armored head | Synonyms: osteostracan |
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| ceroplastics | (noun) the art of modeling in wax. | - |
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| chachalaca | (noun) slender arboreal guan resembling a wild turkey; native to Central America and Mexico; highly regarded as game birds | - |
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| chalaza | (noun) one of two spiral bands of tissue connecting the egg yolk to the enclosing membrane at either end of the shell | - |
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| (noun) basal part of a plant ovule opposite the micropyle; where integument and nucellus are joined | - |
| chalazion | (noun) a small sebaceous cyst of the eyelid resulting when a Meibomian gland is blocked | Synonyms: Meibomian cyst |
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| challah | (noun) (Judaism) a loaf of white bread containing eggs and leavened with yeast; often formed into braided loaves and glazed with eggs before baking | Synonyms: hallah |
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| chamberlain | (noun) the treasurer of a municipal corporation | - |
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| (noun) an officer who manages the household of a king or nobleman | - |
| chaplain | (noun) a clergyman ministering to some institution | - |
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| chaplaincy | (noun) the position of chaplain | Synonyms: chaplainship |
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| chaplainship | (noun) the position of chaplain | Synonyms: chaplaincy |
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| charlatan | (noun) a flamboyant deceiver; one who attracts customers with tricks or jokes | Synonyms: mountebank |
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| charlatanism | (noun) the dishonesty of a charlatan | Synonyms: quackery |
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| chatelaine | (noun) a chain formerly worn at the waist by women; for carrying a purse or bunch of keys etc. | - |
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| (noun) the mistress of a chateau or large country house | - |
| chela | (noun) a Hindu disciple of a swami | - |
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| (noun) a grasping structure on the limb of a crustacean or other arthropods | Synonyms: claw, nipper, pincer |
| chelate | (noun) a heterocyclic compound having a metal ion attached by coordinate bonds to at least two nonmetal ions | Synonyms: chelate compound |
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| chelation | (noun) the process of forming a ring by forming one or more hydrogen bonds | - |
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| (noun) (medicine) the process of removing a heavy metal from the bloodstream by means of a chelate as in treating lead or mercury poisoning | - |
| cherimolla | (noun) large tropical fruit with leathery skin and soft pulp; related to custard apples | Synonyms: cherimoya |
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| chilblain | (noun) inflammation of the hands and feet caused by exposure to cold and moisture | Synonyms: chilblains, pernio |
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| chilblains | (noun) inflammation of the hands and feet caused by exposure to cold and moisture | Synonyms: chilblain, pernio |
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| chinchilla | (noun) small rodent with soft pearly grey fur; native to the Andes but bred in captivity for fur | Synonyms: Chinchilla laniger |
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| (noun) a thick twilled fabric of wool and cotton | - |
| (noun) the expensive silvery grey fur of the chinchilla | - |
| chipolata | (noun) a small thin sausage | - |
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| chlamydia | (noun) coccoid rickettsia infesting birds and mammals; cause infections of eyes and lungs and genitourinary tract | - |
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| (noun) a sexually transmitted infection caused by bacteria of the genus Chlamydia | - |
| chlamydospore | (noun) thick-walled asexual resting spore of certain fungi and algae | - |
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| chlamyphore | (noun) very small Argentine armadillo with pale silky hair and pink plates on head and neck | Synonyms: Chlamyphorus truncatus, fairy armadillo, pichiciago, pichiciego |
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| chlamys | (noun) a short mantle or cape fastened at the shoulder; worn by men in ancient Greece | - |
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| (noun) collective term for the outer parts of a flower consisting of the calyx and corolla and enclosing the stamens and pistils | Synonyms: floral envelope, perianth, perigone, perigonium |
| chlorella | (noun) any alga of the genus Chlorella | - |
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| chloroplast | (noun) plastid containing chlorophyll and other pigments; in plants that carry out photosynthesis | - |
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| chloroplatinate | (noun) any salt of chloroplatinic acid. | - |
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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 |
| cholangiography | (noun) roentgenographic examination of the bile ducts after a contrast medium has been injected | - |
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| cholangitis | (noun) inflammation of the bile ducts | - |
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| cholla | (noun) arborescent cacti having very spiny cylindrical stem segments; southwestern United States and Mexico | Synonyms: Opuntia cholla |
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| chorioallantois | (noun) the very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois | Synonyms: chorioallantoic membrane |
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| christella | (noun) any of several tropical ferns of the genus Christella having thin brittle fronds | - |
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| chromoblastomycosis | (noun) a fungal infection characterized by itchy warty nodules on the skin | - |
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| chromoplast | (noun) plastid containing pigments other than chlorophyll usually yellow or orange carotenoids | - |
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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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| 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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| cilantro | (noun) parsley-like herb used as seasoning or garnish | Synonyms: Chinese parsley, coriander |
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| (noun) Old World herb with aromatic leaves and seed resembling parsley | Synonyms: Chinese parsley, coriander, coriander plant, Coriandrum sativum |
| circular | (noun) an advertisement (usually printed on a page or in a leaflet) intended for wide distribution | Synonyms: bill, broadsheet, broadside, flier, flyer, handbill, throwaway |
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| circularisation | (noun) circulating printed notices as a means of advertising | Synonyms: circularization |
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| circularity | (noun) the roundness of a 2-dimensional figure | Synonyms: disk shape |
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| circularization | (noun) circulating printed notices as a means of advertising | Synonyms: circularisation |
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| circulation | (noun) the spread or transmission of something (as news or money) to a wider group or area | - |
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| (noun) the dissemination of copies of periodicals (as newspapers or magazines) | - |
| (noun) free movement or passage (as of cytoplasm within a cell or sap through a plant) | - |
| (noun) movement through a circuit; especially the movement of blood through the heart and blood vessels | - |
| (noun) number of copies of a newspaper or magazine that are sold | - |
| (noun) (library science) the count of books that are loaned by a library over a specified period | - |
| clabber | (noun) raw milk that has soured and thickened | - |
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| clack | (noun) a simple valve with a hinge on one side; allows fluid to flow in only one direction | Synonyms: clack valve, clapper valve |
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| (noun) a sharp abrupt noise as if two objects hit together; may be repeated | Synonyms: clap |