| 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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| catalectic | (noun) (prosody) a line of verse that lacks a syllable in the last metrical foot | - |
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| catalepsy | (noun) a trancelike state with loss of voluntary motion and failure to react to stimuli | - |
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| cataleptic | (noun) a person suffering from catalepsy | - |
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| catalexis | (noun) the absence of a syllable in the last foot of a line or verse | - |
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| catalog | (noun) a book or pamphlet containing an enumeration of things | Synonyms: catalogue |
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| (noun) a complete list of things; usually arranged systematically | Synonyms: catalogue |
| cataloger | (noun) a librarian who classifies publications according to a categorial system | Synonyms: cataloguer |
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| catalogue | (noun) a book or pamphlet containing an enumeration of things | Synonyms: catalog |
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| (noun) a complete list of things; usually arranged systematically | Synonyms: catalog |
| cataloguer | (noun) a librarian who classifies publications according to a categorial system | Synonyms: cataloger |
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| catalpa | (noun) tree of the genus Catalpa with large leaves and white flowers followed by long slender pods | Synonyms: Indian bean |
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| catalufa | (noun) brightly colored carnivorous fish of western Atlantic and West Indies waters | Synonyms: Priacanthus arenatus |
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| catalysis | (noun) acceleration of a chemical reaction induced by the presence of material that is chemically unchanged at the end of the reaction | Synonyms: contact action |
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| catalyst | (noun) something that causes an important event to happen | - |
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| (noun) (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected | Synonyms: accelerator |
| catcall | (noun) a cry expressing disapproval | - |
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| catchall | (noun) an enclosure or receptacle for odds and ends | - |
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| cathedral | (noun) any large and important church | - |
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| (noun) the principal Christian church building of a bishop's diocese | Synonyms: duomo |
| cattalo | (noun) hardy breed of cattle resulting from crossing domestic cattle with the American buffalo; yields leaner beef than conventional breeds | Synonyms: beefalo |
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| catwalk | (noun) narrow pathway high in the air (as above a stage or between parts of a building or along a bridge) | - |
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| (noun) narrow platform extending out into an auditorium | - |
| causalgia | (noun) a burning pain in a limb along the course of a peripheral nerve; usually associated with skin changes | - |
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| causality | (noun) the relation between causes and effects | - |
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| cavalcade | (noun) a procession of people traveling on horseback | - |
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| cavalier | (noun) a gallant or courtly gentleman | Synonyms: chevalier |
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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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| cavalry | (noun) a highly mobile army unit | - |
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| (noun) troops trained to fight on horseback | Synonyms: horse, horse cavalry |
| cavalryman | (noun) a soldier mounted on horseback | Synonyms: trooper |
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| (noun) a soldier in a motorized army unit | Synonyms: trooper |
| cembalo | (noun) a clavier with strings that are plucked by plectra mounted on pivots | Synonyms: harpsichord |
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| cental | (noun) a United States unit of weight equivalent to 100 pounds | Synonyms: centner, cwt, hundredweight, quintal, short hundredweight |
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| centennial | (noun) the 100th anniversary (or the celebration of it) | Synonyms: centenary |
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| central | (noun) a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication | Synonyms: exchange, telephone exchange |
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| centralisation | (noun) the act of consolidating power under a central control | Synonyms: centralization |
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| (noun) gathering to a center | Synonyms: centralization |
| centralism | (noun) the political policy of concentrating power in a central organization | - |
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| centrality | (noun) the property of being central | - |
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| centralization | (noun) the act of consolidating power under a central control | Synonyms: centralisation |
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| (noun) gathering to a center | Synonyms: centralisation |
| 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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| cephalexin | (noun) a cephalosporin antibiotic (trade names Keflex and Keflin and Keftab) commonly prescribed for mild to moderately severe infections of the skin or ears or throat or lungs or urinary tract | Synonyms: Keflex, Keflin, Keftab |
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| cephalhematoma | (noun) a collection of blood under the scalp of a newborn; caused by pressure during birth | Synonyms: cephalohematoma |
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| cephalitis | (noun) inflammation of the brain usually caused by a virus; symptoms include headache and neck pain and drowsiness and nausea and fever (`phrenitis' is no longer in scientific use) | Synonyms: encephalitis, phrenitis |
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| cephalochordate | (noun) fish-like animals having a notochord rather than a true spinal column | - |
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| cephaloglycin | (noun) antibiotic related to cephalosporin but no longer in common use | Synonyms: Kafocin |
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| cephalohematoma | (noun) a collection of blood under the scalp of a newborn; caused by pressure during birth | Synonyms: cephalhematoma |
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| cephalometry | (noun) measurement of human heads | - |
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| cephalopod | (noun) marine mollusk characterized by well-developed head and eyes and sucker-bearing tentacles | Synonyms: cephalopod mollusk |
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| cephaloridine | (noun) a broad spectrum semisynthetic antibiotic produced by modifying cephalosporin | - |
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| cephalosporin | (noun) one of several broad spectrum antibiotic substances obtained from fungi and related to penicillin (trade names Mefoxin); addition of side chains has produced semisynthetic antibiotics with greater antibacterial activity | Synonyms: Mefoxin |
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| cephalothin | (noun) a semisynthetic analogue of cephalosporin | - |
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| cereal | (noun) a breakfast food prepared from grain | - |
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| (noun) foodstuff prepared from the starchy grains of cereal grasses | Synonyms: food grain, grain |
| (noun) grass whose starchy grains are used as food: wheat, rice, rye, oats, maize, buckwheat, millet | Synonyms: cereal grass |
| ceremonial | (noun) a formal event performed on a special occasion | Synonyms: ceremonial occasion, ceremony, observance |
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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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| chalcanthite | (noun) hydrated blue crystalline form of copper sulfate | Synonyms: blue copperas, blue stone, blue vitriol |
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| chalcedony | (noun) a milky or greyish translucent to transparent quartz | Synonyms: calcedony |
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| chalcid | (noun) any of various tiny insects whose larvae are parasites on eggs and larvae of other insects; many are beneficial in destroying injurious insects | Synonyms: chalcid fly, chalcid wasp, chalcidfly |
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| chalcidfly | (noun) any of various tiny insects whose larvae are parasites on eggs and larvae of other insects; many are beneficial in destroying injurious insects | Synonyms: chalcid, chalcid fly, chalcid wasp |
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| chalcocite | (noun) a heavy grey mineral that is an ore of copper | Synonyms: copper glance |
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| chalcopyrite | (noun) a yellow copper ore (CuFeS2) made up of copper and iron sulfide | Synonyms: copper pyrites |
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| chaldron | (noun) a British imperial capacity measure (liquid or dry) equal to 36 bushels | - |
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| chalet | (noun) a Swiss house with a sloping roof and wide eaves or a house built in this style | - |
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| chalice | (noun) a bowl-shaped drinking vessel; especially the Eucharistic cup | Synonyms: goblet |
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| chalk | (noun) a piece of calcite or a similar substance, usually in the shape of a crayon, that is used to write or draw on blackboards or other flat surfaces | - |
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| (noun) an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant | Synonyms: chicken feed, crank, deoxyephedrine, glass, ice, meth, methamphetamine, methamphetamine hydrochloride, Methedrine, shabu, trash |
| (noun) a pure flat white with little reflectance | - |
| (noun) a soft whitish calcite | - |
| chalkboard | (noun) sheet of slate; for writing with chalk | Synonyms: blackboard |
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| chalkpit | (noun) a quarry for chalk | Synonyms: chalk pit |
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| chalkstone | (noun) a deposit of urates around a joint or in the external ear; diagnostic of advanced or chronic gout | Synonyms: tophus |
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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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| challenge | (noun) a call to engage in a contest or fight | - |
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| (noun) questioning a statement and demanding an explanation | - |
| (noun) a formal objection to the selection of a particular person as a juror | - |
| (noun) a demand by a sentry for a password or identification | - |
| (noun) a demanding or stimulating situation | - |
| challenger | (noun) the contestant you hope to defeat | Synonyms: competition, competitor, contender, rival |
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| challis | (noun) a soft lightweight fabric (usually printed) | - |
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| chalybite | (noun) iron ore in the form of ferrous carbonate | Synonyms: siderite |
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| chanal | (noun) thorny shrub or small tree common in central Argentina having small orange or yellow flowers followed by edible berries | Synonyms: chanar, Geoffroea decorticans |
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| chaparral | (noun) dense vegetation consisting of stunted trees or bushes | Synonyms: bush, scrub |
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| charcoal | (noun) a stick of black carbon material used for drawing | Synonyms: fusain |
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| (noun) a drawing made with a stick of black carbon material | - |
| (noun) a very dark grey color | Synonyms: charcoal gray, charcoal grey, oxford gray, oxford grey |
| (noun) a carbonaceous material obtained by heating wood or other organic matter in the absence of air | Synonyms: wood coal |
| chemical | (noun) material produced by or used in a reaction involving changes in atoms or molecules | Synonyms: chemical substance |
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| chevalier | (noun) a gallant or courtly gentleman | Synonyms: cavalier |
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| chiralgia | (noun) a pain in the hand that is not traumatic | - |
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| chivalry | (noun) courtesy towards women | Synonyms: gallantry, politesse |
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| (noun) the medieval principles governing knighthood and knightly conduct | Synonyms: knightliness |
| chlorobenzylidenemalononitrile | (noun) a tear gas that is stronger than CN gas but wears off faster; can be deployed by grenades or cluster bombs; can cause skin burns and fatal pulmonary edema | Synonyms: CS gas |
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| chlorthalidone | (noun) a diuretic (trade names Hygroton and Thalidone) used to control hypertension and conditions that cause edema; effective in lowering blood pressure to prevent heart attacks | Synonyms: Hygroton, Thalidone |
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| cholecalciferol | (noun) a fat-soluble vitamin that prevents rickets | Synonyms: calciferol, D, ergocalciferol, viosterol, vitamin D |
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| choral | (noun) a stately Protestant (especially Lutheran) hymn tune | Synonyms: chorale |
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| chorale | (noun) a stately Protestant (especially Lutheran) hymn tune | Synonyms: choral |
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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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| chrysalis | (noun) pupa of a moth or butterfly enclosed in a cocoon | - |
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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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| classical | (noun) traditional genre of music conforming to an established form and appealing to critical interest and developed musical taste | Synonyms: classical music, serious music |
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| classicalism | (noun) a movement in literature and art during the 17th and 18th centuries in Europe that favored rationality and restraint and strict forms | Synonyms: classicism |
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| clericalism | (noun) a policy of supporting the influence and power of the clergy in secular or political matters | - |
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| clericalist | (noun) one who advocates clericalism | - |
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| clericalization | (noun) The process of increasing the power or influence of a religious hierarchy. | - |
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| clinocephalism | (noun) a congenital defect in which the top of the head is depressed (concave instead of convex) | Synonyms: clinocephaly |
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| clinocephaly | (noun) a congenital defect in which the top of the head is depressed (concave instead of convex) | Synonyms: clinocephalism |
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| coal | (noun) a hot fragment of wood or coal that is left from a fire and is glowing or smoldering | Synonyms: ember |
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| (noun) fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period | - |
| coalbin | (noun) a bin for holding coal | Synonyms: coalhole |
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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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| coalescency | (noun) the union of diverse things into one body or form or group; the growing together of parts | Synonyms: coalescence, coalition, concretion, conglutination |
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| coalface | (noun) the part of a coal seam that is being cut | - |
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| coalfield | (noun) a region where there is coal underground | - |
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| coalhole | (noun) a bin for holding coal | Synonyms: coalbin |
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| coalition | (noun) the union of diverse things into one body or form or group; the growing together of parts | Synonyms: coalescence, coalescency, concretion, conglutination |
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| (noun) an organization of people (or countries) involved in a pact or treaty | Synonyms: alignment, alinement, alliance |
| (noun) the state of being combined into one body | Synonyms: fusion |