| calibre | (noun) a degree or grade of excellence or worth | Synonyms: caliber, quality |
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| (noun) diameter of a tube or gun barrel | Synonyms: bore, caliber, gauge |
| caliche | (noun) nitrate-bearing rock or gravel of the sodium nitrate deposits of Chile and Peru | - |
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| (noun) crust or layer of hard subsoil encrusted with calcium-carbonate occurring in arid or semiarid regions | Synonyms: hardpan |
| calico | (noun) coarse cloth with a bright print | - |
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| caliculus | (noun) a small cup-shaped structure (as a taste bud or optic cup or cavity of a coral containing a polyp) | Synonyms: calycle, calyculus |
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| calif | (noun) the civil and religious leader of a Muslim state considered to be a representative of Allah on earth | Synonyms: caliph, kalif, kaliph, khalif, khalifah |
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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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| caliper | (noun) an instrument for measuring the distance between two points | Synonyms: calliper |
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| caliph | (noun) the civil and religious leader of a Muslim state considered to be a representative of Allah on earth | Synonyms: calif, kalif, kaliph, khalif, khalifah |
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| caliphate | (noun) the office of a caliph | - |
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| (noun) the territorial jurisdiction of a caliph | - |
| calisaya | (noun) Peruvian shrub or small tree having large glossy leaves and cymes of fragrant yellow to green or red flowers; cultivated for its medicinal bark | Synonyms: Cinchona calisaya, Cinchona ledgeriana, Cinchona officinalis |
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| calisthenics | (noun) the practice of calisthenic exercises | Synonyms: callisthenics |
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| (noun) light exercises designed to promote general fitness | Synonyms: callisthenics |
| calk | (noun) a metal cleat on the bottom front of a horseshoe to prevent slipping | Synonyms: calkin |
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| calkin | (noun) a metal cleat on the bottom front of a horseshoe to prevent slipping | Synonyms: calk |
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| call | (noun) (sports) the decision made by an umpire or referee | - |
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| (noun) a visit in an official or professional capacity | - |
| (noun) a brief social visit | - |
| (noun) the option to buy a given stock (or stock index or commodity future) at a given price before a given date | Synonyms: call option |
| (noun) a method of contacting a person by phone | Synonyms: phone call, telephone call |
| (noun) a loud utterance; often in protest or opposition | Synonyms: cry, outcry, shout, vociferation, yell |
| (noun) the characteristic sound produced by a bird | Synonyms: birdcall, birdsong, song |
| (noun) a request | - |
| (noun) a demand | Synonyms: claim |
| (noun) a demand for a show of hands in a card game | - |
| (noun) an instruction that interrupts the program being executed | - |
| (noun) a demand by a broker that a customer deposit enough to bring his margin up to the minimum requirement | Synonyms: margin call |
| 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 |
| callback | (noun) a request by the manufacturer of a defective product to return the product (as for replacement or repair) | Synonyms: recall |
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| caller | (noun) a social or business visitor | Synonyms: company |
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| (noun) the person initiating a telephone call | Synonyms: caller-up, phoner, telephoner |
| (noun) the person who convenes a meeting | - |
| (noun) someone who proclaims or summons in a loud voice | - |
| (noun) a person who announces the changes of steps during a dance | Synonyms: caller-out |
| (noun) the bettor in a card game who matches the bet and calls for a show of hands | - |
| (noun) an investor who buys a call option | - |
| calliandra | (noun) any of various shrubs and small trees valued for their fine foliage and attractive spreading habit and clustered white to deep pink or red flowers | - |
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| calligrapher | (noun) someone skilled in penmanship | Synonyms: calligraphist |
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| calligraphist | (noun) someone skilled in penmanship | Synonyms: calligrapher |
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| calligraphy | (noun) beautiful handwriting | Synonyms: chirography, penmanship |
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| calling | (noun) the particular occupation for which you are trained | Synonyms: career, vocation |
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| calliope | (noun) a musical instrument consisting of a series of steam whistles played from a keyboard | Synonyms: steam organ |
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| calliopsis | (noun) North American annual widely cultivated for its yellow flowers with purple-red to brownish centers; in some classifications placed in a subgenus Calliopsis | Synonyms: Coreopsis tinctoria |
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| calliper | (noun) an instrument for measuring the distance between two points | Synonyms: caliper |
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| callisthenics | (noun) the practice of calisthenic exercises | Synonyms: calisthenics |
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| (noun) light exercises designed to promote general fitness | Synonyms: calisthenics |
| 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 |
| callosectomy | (noun) severing the corpus callosum so that communication between the cerebral hemispheres is interrupted (in cases of severe intractable epilepsy) | Synonyms: callosotomy |
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| callosity | (noun) devoid of passion or feeling; hardheartedness | Synonyms: callousness, hardness, insensibility, unfeelingness |
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| (noun) an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot) | Synonyms: callus |
| callosotomy | (noun) severing the corpus callosum so that communication between the cerebral hemispheres is interrupted (in cases of severe intractable epilepsy) | Synonyms: callosectomy |
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| callousness | (noun) devoid of passion or feeling; hardheartedness | Synonyms: callosity, hardness, insensibility, unfeelingness |
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| callowness | (noun) lacking and evidencing lack of experience of life | Synonyms: jejuneness, juvenility |
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| callus | (noun) (botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid | - |
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| (noun) bony tissue formed during the healing of a fractured bone | - |
| (noun) an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot) | Synonyms: callosity |
| calm | (noun) steadiness of mind under stress | Synonyms: calmness, composure, equanimity |
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| (noun) wind moving at less than 1 knot; 0 on the Beaufort scale | Synonyms: calm air |
| calming | (noun) the act of appeasing (as by acceding to the demands of) | Synonyms: appeasement |
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| calmness | (noun) steadiness of mind under stress | Synonyms: calm, composure, equanimity |
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| (noun) a feeling of calm; an absence of agitation or excitement | - |
| (noun) an absence of strong winds or rain | - |
| calomel | (noun) a tasteless colorless powder used medicinally as a cathartic | Synonyms: mercurous chloride |
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| calorie | (noun) unit of heat defined as the quantity of heat required to raise the temperature of 1 gram of water by 1 degree centigrade at atmospheric pressure | Synonyms: gram calorie, small calorie |
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| calorimeter | (noun) a measuring instrument that determines quantities of heat | - |
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| calorimetry | (noun) measurement of quantities of heat | - |
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| calorisator | (noun) an apparatus used in beet-sugar factories to heat the juice in order to aid the diffusion. | Synonyms: calorizator |
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| calorizator | (noun) an apparatus used in beet-sugar factories to heat the juice in order to aid the diffusion. | Synonyms: calorisator |
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| calosoma | (noun) any beetle of the genus Calosoma | - |
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| calpac | (noun) a high-crowned black cap (usually made of felt or sheepskin) worn by men in Turkey and Iran and the Caucasus | Synonyms: calpack, kalpac |
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| calpack | (noun) a high-crowned black cap (usually made of felt or sheepskin) worn by men in Turkey and Iran and the Caucasus | Synonyms: calpac, kalpac |
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| calque | (noun) an expression introduced into one language by translating it from another language | Synonyms: calque formation, loan translation |
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| caltrop | (noun) tropical annual procumbent poisonous subshrub having fruit that splits into five spiny nutlets; serious pasture weed | Synonyms: devil's weed, Tribulus terestris |
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| (noun) Mediterranean annual or biennial herb having pinkish to purple flowers surrounded by spine-tipped scales; naturalized in America | Synonyms: Centauria calcitrapa, star-thistle |
| (noun) a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits | Synonyms: water chestnut, water chestnut plant |
| 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 |
| calvaria | (noun) the dome of the skull | Synonyms: skullcap |
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| calvary | (noun) any experience that causes intense suffering | Synonyms: martyrdom |
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| calving | (noun) giving birth to a calf | - |
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| calx | (noun) a white crystalline oxide used in the production of calcium hydroxide | Synonyms: burnt lime, calcined lime, calcium oxide, fluxing lime, lime, quicklime, unslaked lime |
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| calycle | (noun) a small cup-shaped structure (as a taste bud or optic cup or cavity of a coral containing a polyp) | Synonyms: caliculus, calyculus |
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| (noun) a group of bracts simulating a calyx as in a carnation or hibiscus | Synonyms: calyculus, epicalyx, false calyx |
| calyculus | (noun) a small cup-shaped structure (as a taste bud or optic cup or cavity of a coral containing a polyp) | Synonyms: caliculus, calycle |
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| (noun) a group of bracts simulating a calyx as in a carnation or hibiscus | Synonyms: calycle, epicalyx, false calyx |
| calypso | (noun) rare north temperate bog orchid bearing a solitary white to pink flower marked with purple at the tip of an erect reddish stalk above 1 basal leaf | Synonyms: Calypso bulbosa, fairy-slipper |
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| calypter | (noun) scalelike structure between the base of the wing and the halter of a two-winged fly | Synonyms: alula |
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| calyptra | (noun) the hood or cap covering the calyx of certain plants: e.g., the California poppy | - |
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| calyx | (noun) (botany) the whorl of sepals of a flower collectively forming the outer floral envelope or layer of the perianth enclosing and supporting the developing bud; usually green | - |
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| cam | (noun) a rotating disk shaped to convert circular into linear motion | - |
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| camachile | (noun) common thorny tropical American tree having terminal racemes of yellow flowers followed by sickle-shaped or circinate edible pods and yielding good timber and a yellow dye and mucilaginous gum | Synonyms: huamachil, manila tamarind, Pithecellobium dulce, wild tamarind |
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| camail | (noun) a medieval hood of mail suspended from a basinet to protect the head and neck | Synonyms: aventail, ventail |
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| camaraderie | (noun) the quality of affording easy familiarity and sociability | Synonyms: chumminess, comradeliness, comradery, comradeship |
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| camarilla | (noun) a clique (often secret) that seeks power usually through intrigue | Synonyms: cabal, faction, junto |
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| camas | (noun) any of several plants of the genus Camassia; North and South America | Synonyms: camash, camass, camosh, quamash |
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| camash | (noun) any of several plants of the genus Camassia; North and South America | Synonyms: camas, camass, camosh, quamash |
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| camass | (noun) any of several plants of the genus Camassia; North and South America | Synonyms: camas, camash, camosh, quamash |
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| camber | (noun) the alignment of the wheels of a motor vehicle closer together at the bottom than at the top | - |
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| (noun) a slope in the turn of a road or track; the outside is higher than the inside in order to reduce the effects of centrifugal force | Synonyms: bank, cant |
| (noun) a slight convexity (as of the surface of a road) | - |
| 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 | - |
| cambric | (noun) a finely woven white linen | - |
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| camcorder | (noun) a portable television camera and videocassette recorder | - |
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| camel | (noun) cud-chewing mammal used as a draft or saddle animal in desert regions | - |
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| camelhair | (noun) a soft tan cloth made with the hair of a camel | Synonyms: camel's hair |
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| camelia | (noun) any of several shrubs or small evergreen trees having solitary white or pink or reddish flowers | Synonyms: camellia |
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| camellia | (noun) any of several shrubs or small evergreen trees having solitary white or pink or reddish flowers | Synonyms: camelia |
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| camelopard | (noun) tallest living quadruped; having a spotted coat and small horns and very long neck and legs; of savannahs of tropical Africa | Synonyms: Giraffa camelopardalis, giraffe |
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| camelpox | (noun) a viral disease of camels closely related to smallpox | - |
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| cameo | (noun) engraving or carving in low relief on a stone (as in a brooch or ring) | - |
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| camera | (noun) equipment for taking photographs (usually consisting of a lightproof box with a lens at one end and light-sensitive film at the other) | Synonyms: photographic camera |
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| (noun) television equipment consisting of a lens system that focuses an image on a photosensitive mosaic that is scanned by an electron beam | Synonyms: television camera, tv camera |
| cameraman | (noun) a photographer who operates a movie camera | Synonyms: camera operator, cinematographer |
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| camgirl | (noun) a female performer who performs sexual acts by camera on the internet | - |
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| camion | (noun) a low heavy horse cart without sides; used for haulage | Synonyms: dray |
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| (noun) a large truck designed to carry heavy loads; usually without sides | Synonyms: lorry |
| camise | (noun) a loose shirt or tunic; originally worn in the Middle Ages | - |
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| camisole | (noun) a short negligee | - |
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| (noun) a short sleeveless undergarment for women | Synonyms: underbodice |
| camlet | (noun) a fabric of Asian origin; originally made of silk and camel's hair | - |
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| (noun) a garment made of camlet fabric | - |
| camo | (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: camouflage |
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| camomile | (noun) Eurasian plant with apple-scented foliage and white-rayed flowers and feathery leaves used medicinally; in some classification systems placed in genus Anthemis | Synonyms: Anthemis nobilis, Chamaemelum nobilis, chamomile |
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| camosh | (noun) any of several plants of the genus Camassia; North and South America | Synonyms: camas, camash, camass, quamash |
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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 |
| camp | (noun) temporary living quarters specially built by the army for soldiers | Synonyms: bivouac, cantonment, encampment |
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| (noun) temporary lodgings in the country for travelers or vacationers | - |
| (noun) a penal institution (often for forced labor) | - |
| (noun) a site where care and activities are provided for children during the summer months | Synonyms: summer camp |
| (noun) shelter for persons displaced by war or political oppression or for religious beliefs | Synonyms: refugee camp |
| (noun) something that is considered amusing not because of its originality but because of its unoriginality | - |
| (noun) a group of people living together in a camp | - |
| (noun) an exclusive circle of people with a common purpose | Synonyms: clique, coterie, ingroup, inner circle, pack |
| campaign | (noun) several related operations aimed at achieving a particular goal (usually within geographical and temporal constraints) | Synonyms: military campaign |
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| (noun) an overland journey by hunters (especially in Africa) | Synonyms: hunting expedition, safari |
| (noun) a series of actions advancing a principle or tending toward a particular end | Synonyms: cause, crusade, drive, effort, movement |
| (noun) a race between candidates for elective office | Synonyms: political campaign, run |
| campaigner | (noun) a politician who is running for public office | Synonyms: candidate, nominee |
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| campaigning | (noun) the campaign of a candidate to be elected | Synonyms: candidacy, candidature, electioneering, political campaign |
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| campana | (noun) the shape of a bell | Synonyms: bell, bell shape |
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| campanile | (noun) a bell tower; usually stands alone unattached to a building | Synonyms: belfry |
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| campanula | (noun) any of various plants of the genus Campanula having blue or white bell-shaped flowers | Synonyms: bellflower |
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| campeachy | (noun) spiny shrub or small tree of Central America and West Indies having bipinnate leaves and racemes of small bright yellow flowers and yielding a hard brown or brownish-red heartwood used in preparing a black dye | Synonyms: bloodwood tree, Haematoxylum campechianum, logwood, logwood tree |
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| camper | (noun) a recreational vehicle equipped for camping out while traveling | Synonyms: camping bus, motor home |
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| (noun) someone living temporarily in a tent or lodge for recreation | - |