| centrefold | (noun) a magazine center spread; especially a foldout of a large photograph or map or other feature | Synonyms: centerfold |
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| centrepiece | (noun) something placed at the center of something else (as on a table) | Synonyms: centerpiece |
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| (noun) the central or most important feature | Synonyms: centerpiece |
| centrex | (noun) (CENTRal EXchange) a kind of telephone exchange | - |
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| centrifugation | (noun) the process of separating substances of different densities by the use of a centrifuge | - |
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| centrifuge | (noun) an apparatus that uses centrifugal force to separate particles from a suspension | Synonyms: extractor, separator |
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| centring | (noun) (American football) putting the ball in play by passing it (between the legs) to a back | Synonyms: centering, snap |
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| (noun) the concentration of attention or energy on something | Synonyms: centering, direction, focal point, focus, focusing, focussing |
| centriole | (noun) one of a pair of small cylindrical cell organelles near the nucleus in animal cells; composed of nine triplet microtubules and form the asters during mitosis | - |
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| centrism | (noun) a political philosophy of avoiding the extremes of left and right by taking a moderate position or course of action | Synonyms: moderatism |
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| centrist | (noun) a person who takes a position in the political center | Synonyms: middle of the roader, moderate, moderationist |
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| centroid | (noun) the center of mass of an object of uniform density | - |
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| centromere | (noun) a specialized condensed region of each chromosome that appears during mitosis where the chromatids are held together to form an X shape | Synonyms: kinetochore |
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| centrosome | (noun) small region of cytoplasm adjacent to the nucleus; contains the centrioles and serves to organize the microtubules | Synonyms: central body |
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| centrum | (noun) the main body of a vertebra | - |
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| cephalometry | (noun) measurement of human heads | - |
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| cetrimide | (noun) a cationic detergent that is a powerful disinfectant | - |
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| chantry | (noun) a chapel endowed for singing Masses for the soul of the donor | - |
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| (noun) an endowment for the singing of Masses | - |
| chartreuse | (noun) a shade of green tinged with yellow | Synonyms: Paris green, pea green, yellow green, yellowish green |
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| chatroom | (noun) a site on the internet where a number of users can communicate in real time (typically one dedicated to a particular topic) | Synonyms: chat room |
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| chemistry | (noun) the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions | Synonyms: chemical science |
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| (noun) the way two individuals relate to each other | Synonyms: alchemy, interpersonal chemistry |
| (noun) the chemical composition and properties of a substance or object | - |
| chemoattractant | (noun) a substance inducing positive chemotaxis in motile cells. | - |
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| chemoautotroph | (noun) An organism that depends on chemicals for its energy and principally on carbon dioxide for its carbon. | Synonyms: chemotrophic autotroph |
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| chetrum | (noun) 100 chetrums equal 1 ngultrum in Bhutan | - |
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| 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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| chlortetracycline | (noun) a yellow crystalline antibiotic (trade name Aureomycin) used to treat certain bacterial and rickettsial diseases | Synonyms: Aureomycin |
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| chondrodystrophy | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasia, achondroplasty, osteosclerosis congenita |
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| cicatrice | (noun) a mark left (usually on the skin) by the healing of injured tissue | Synonyms: cicatrix, scar |
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| cicatrix | (noun) a mark left (usually on the skin) by the healing of injured tissue | Synonyms: cicatrice, scar |
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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 |
| circuitry | (noun) electronic equipment consisting of a system of circuits | - |
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| cirrostratus | (noun) a thin uniform layer of hazy cloud at high altitude | Synonyms: cirrostratus cloud |
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| cistron | (noun) (genetics) a segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the coding DNA as well as introns between the exons; it is considered a unit of heredity | Synonyms: factor, gene |
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| citrange | (noun) more aromatic and acid tasting than oranges; used in beverages and marmalade | - |
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| (noun) more aromatic and acidic than oranges | Synonyms: citrange tree, Citroncirus webberi |
| citrate | (noun) a salt or ester of citric acid | - |
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| citrin | (noun) a vitamin that maintains the resistance of cell and capillary walls to permeation | Synonyms: bioflavinoid, vitamin P |
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| citrine | (noun) semiprecious yellow quartz resembling topaz | - |
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| citron | (noun) large lemonlike fruit with thick aromatic rind; usually preserved | - |
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| (noun) thorny evergreen small tree or shrub of India widely cultivated for its large lemonlike fruits that have thick warty rind | Synonyms: citron tree, Citrus medica |
| citronwood | (noun) wood of a citron tree | - |
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| (noun) durable fragrant wood; used in building (as in the roof of the cathedral at Cordova, Spain) | Synonyms: sandarac |
| citrulline | (noun) an amino acid that does not occur in proteins but is an intermediate in the conversion of ornithine to arginine | - |
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| citrus | (noun) any of numerous fruits of the genus Citrus having thick rind and juicy pulp; grown in warm regions | Synonyms: citrous fruit, citrus fruit |
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| (noun) any of numerous tropical usually thorny evergreen trees of the genus Citrus having leathery evergreen leaves and widely cultivated for their juicy edible fruits having leathery aromatic rinds | Synonyms: citrus tree |
| claptrap | (noun) pompous or pretentious talk or writing | Synonyms: blah, bombast, fustian, rant |
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| claustrophobe | (noun) a person suffering from claustrophobia | - |
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| claustrophobia | (noun) a morbid fear of being closed in a confined space | - |
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| claustrum | (noun) a layer of grey matter in the brain adjacent to the lenticular nucleus | - |
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| clostridia | (noun) spindle-shaped bacterial cell especially one swollen at the center by an endospore | Synonyms: clostridium |
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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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| coatrack | (noun) a rack with hooks for temporarily holding coats and hats | Synonyms: coat rack, hatrack |
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| coatroom | (noun) a room where coats and other articles can be left temporarily | Synonyms: cloakroom |
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| cockatrice | (noun) monster hatched by a reptile from a cock's egg; able to kill with a glance | - |
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| colorimetry | (noun) quantitative chemical analysis by color using a colorimeter | Synonyms: colorimetric analysis |
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| colostrum | (noun) milky fluid secreted for the first day or two after parturition | Synonyms: foremilk |
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| compatriot | (noun) a person from your own country | - |
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| comptroller | (noun) someone who maintains and audits business accounts | Synonyms: accountant, controller |
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| comptrollership | (noun) the position of comptroller | - |
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| concentrate | (noun) a concentrated example of something | - |
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| (noun) a concentrated form of a foodstuff; the bulk is reduced by removing water | - |
| (noun) the desired mineral that is left after impurities have been removed from mined ore | Synonyms: dressed ore |
| concentration | (noun) strengthening the concentration (as of a solute in a mixture) by removing diluting material | - |
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| (noun) bringing together military forces | - |
| (noun) great and constant diligence and attention | Synonyms: assiduity, assiduousness |
| (noun) the strength of a solution; number of molecules of a substance in a given volume | - |
| (noun) the spatial property of being crowded together | Synonyms: compactness, denseness, density, tightness |
| (noun) complete attention; intense mental effort | Synonyms: absorption, engrossment, immersion |
| (noun) increase in density | - |
| concentricity | (noun) the quality of having the same center (as circles inside one another) | - |
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| conductress | (noun) a woman conductor | - |
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| constraint | (noun) the act of constraining; the threat or use of force to control the thoughts or behavior of others | - |
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| (noun) a device that retards something's motion | Synonyms: restraint |
| (noun) the state of being physically constrained | Synonyms: restraint |
| constriction | (noun) the action or process of compressing | - |
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| (noun) a tight feeling in some part of the body | Synonyms: tightness |
| (noun) tight or narrow compression | Synonyms: coarctation |
| (noun) a narrowing that reduces the flow through a channel | Synonyms: bottleneck, chokepoint |
| constrictor | (noun) any of various large nonvenomous snakes that kill their prey by crushing it in its coils | - |
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| construal | (noun) an interpretation of the meaning of something; the act of construing | - |
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| construct | (noun) an abstract or general idea inferred or derived from specific instances | Synonyms: concept, conception |
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| construction | (noun) the act of constructing something | Synonyms: building |
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| (noun) the commercial activity involved in repairing old structures or constructing new ones | Synonyms: building |
| (noun) drawing a figure satisfying certain conditions as part of solving a problem or proving a theorem | - |
| (noun) a thing constructed; a complex entity constructed of many parts | Synonyms: structure |
| (noun) the creation of a construct; the process of combining ideas into a congruous object of thought | Synonyms: mental synthesis |
| (noun) an interpretation of a text or action | Synonyms: twist |
| (noun) a group of words that form a constituent of a sentence and are considered as a single unit | Synonyms: expression, grammatical construction |
| constructiveness | (noun) the quality of serving to build or improve | - |
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| constructivism | (noun) an abstractionist artistic movement in Russia after World War I; industrial materials were used to construct nonrepresentational objects | - |
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| constructivist | (noun) an artist of the school of constructivism | - |
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| constructor | (noun) someone who contracts for and supervises construction (as of a building) | Synonyms: builder |
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| contraband | (noun) goods whose importation or exportation or possession is prohibited by law | - |
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| contrabandist | (noun) someone who imports or exports without paying duties | Synonyms: moon-curser, moon curser, runner, smuggler |
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| contrabass | (noun) largest and lowest member of the violin family | Synonyms: bass fiddle, bass viol, bull fiddle, double bass, string bass |
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| contrabassoon | (noun) the bassoon that is the largest instrument in the oboe family | Synonyms: contrafagotto, double bassoon |
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| contraception | (noun) birth control by the use of devices (diaphragm or intrauterine device or condom) or drugs or surgery | Synonyms: contraceptive method |
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| contraceptive | (noun) an agent or device intended to prevent conception | Synonyms: birth control device, contraceptive device, preventative, preventive, prophylactic device |
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| contract | (noun) a variety of bridge in which the bidder receives points toward game only for the number of tricks he bid | Synonyms: contract bridge |
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| (noun) a binding agreement between two or more persons that is enforceable by law | - |
| (noun) (contract bridge) the highest bid becomes the contract setting the number of tricks that the bidder must make | Synonyms: declaration |
| contractility | (noun) the capability or quality of shrinking or contracting, especially by muscle fibers and even some other forms of living matter | - |
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| contracting | (noun) becoming infected | Synonyms: catching |
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| contraction | (noun) the act of decreasing (something) in size or volume or quantity or scope | - |
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| (noun) (physiology) a shortening or tensing of a part or organ (especially of a muscle or muscle fiber) | Synonyms: muscle contraction, muscular contraction |
| (noun) a word formed from two or more words by omitting or combining some sounds | - |
| (noun) the process or result of becoming smaller or pressed together | Synonyms: compression, condensation |
| contractor | (noun) a bodily organ that contracts | Synonyms: contractile organ |
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| (noun) someone (a person or firm) who contracts to build things | - |
| (noun) (law) a party to a contract | - |
| (noun) the bridge player in contract bridge who wins the bidding and can declare which suit is to be trumps | Synonyms: declarer |
| contracture | (noun) an abnormal and usually permanent contraction of a muscle | - |
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| contradance | (noun) a type of folk dance in which couples are arranged in sets or face one another in a line | Synonyms: contra danse, contredanse, country-dance, country dancing |
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| contradiction | (noun) the speech act of contradicting someone | - |
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| (noun) (logic) a statement that is necessarily false | Synonyms: contradiction in terms |
| (noun) opposition between two conflicting forces or ideas | - |
| contradictoriness | (noun) the relation that exists when opposites cannot coexist | - |
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| contradictory | (noun) two propositions are contradictories if both cannot be true (or both cannot be false) at the same time | - |
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| contradistinction | (noun) a distinction drawn on the basis of contrast | - |
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| contrafagotto | (noun) the bassoon that is the largest instrument in the oboe family | Synonyms: contrabassoon, double bassoon |
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| contrail | (noun) an artificial cloud created by an aircraft; caused either by condensation due to the reduction in air pressure above the wing surface or by water vapor in the engine exhaust | Synonyms: condensation trail |
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| contraindication | (noun) (medicine) a reason that makes it inadvisable to prescribe a particular drug or employ a particular procedure or treatment | - |
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| contralto | (noun) the lowest female singing voice | Synonyms: alto |
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| (noun) a woman singer having a contralto voice | - |
| contraption | (noun) a device or control that is very useful for a particular job | Synonyms: appliance, contrivance, convenience, gadget, gismo, gizmo, widget |
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| contrapuntist | (noun) a composer who specializes in counterpoint | - |
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| contrarian | (noun) an investor who deliberately decides to go against the prevailing wisdom of other investors | - |
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| contrariety | (noun) the relation between contraries | - |
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| contrariness | (noun) a fussy and eccentric disposition | Synonyms: crankiness, crotchetiness, grumpiness |
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| (noun) deliberate and stubborn unruliness and resistance to guidance or discipline | Synonyms: perverseness, perversity |
| contrary | (noun) exact opposition | - |
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| (noun) a relation of direct opposition | Synonyms: opposite, reverse |
| (noun) a logical relation such that two propositions are contraries if both cannot be true but both can be false | - |
| contrast | (noun) the act of distinguishing by comparing differences | - |
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| (noun) the range of optical density and tone on a photographic negative or print (or the extent to which adjacent areas on a television screen differ in brightness) | - |
| (noun) the perceptual effect of the juxtaposition of very different colors | - |
| (noun) a conceptual separation or distinction | Synonyms: demarcation, dividing line, line |
| (noun) the opposition or dissimilarity of things that are compared | Synonyms: direct contrast |
| contravallation | (noun) a fortification build around a sieged target by the besiegers to prevent attacks by the defenders. | - |
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| contravention | (noun) coming into conflict with | Synonyms: dispute |
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| contredanse | (noun) a type of folk dance in which couples are arranged in sets or face one another in a line | Synonyms: contra danse, contradance, country-dance, country dancing |
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| contretemps | (noun) an awkward clash | - |
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| contribution | (noun) act of giving in common with others for a common purpose especially to a charity | Synonyms: donation |
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| (noun) a writing for publication especially one of a collection of writings as an article or story | - |
| (noun) the effort contributed by a person in bringing about a result | Synonyms: part, share |
| (noun) a voluntary gift (as of money or service or ideas) made to some worthwhile cause | Synonyms: donation |
| (noun) an amount of money contributed | - |