| acyclovir | (noun) an oral antiviral drug (trade name Zovirax) used to treat genital herpes; does not cure the disease but relieves the symptoms | Synonyms: Zovirax |
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| anticyclone | (noun) (meteorology) winds spiraling outward from a high pressure center; circling clockwise in the Northern Hemisphere and counterclockwise in the southern | - |
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| backcloth | (noun) scenery hung at back of stage | Synonyms: backdrop, background |
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| bedclothes | (noun) coverings that are used on a bed | Synonyms: bed clothing, bedding |
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| bookcloth | (noun) a woven fabric (usually cotton) used for book covers. | Synonyms: book cloth |
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| breechcloth | (noun) a garment that provides covering for the loins | Synonyms: breechclout, loincloth |
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| breechclout | (noun) a garment that provides covering for the loins | Synonyms: breechcloth, loincloth |
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| broadcloth | (noun) a closely woven silk or synthetic fabric with a narrow crosswise rib | - |
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| (noun) a densely textured woolen fabric with a lustrous finish | - |
| cerecloth | (noun) a waterproof waxed cloth once used as a shroud | - |
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| cheesecloth | (noun) a coarse loosely woven cotton gauze; originally used to wrap cheeses | - |
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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 | - |
| cloak | (noun) a loose outer garment | - |
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| (noun) anything that covers or conceals | - |
| cloakmaker | (noun) someone whose occupation is making or repairing fur garments | Synonyms: furrier |
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| cloakroom | (noun) a room where coats and other articles can be left temporarily | Synonyms: coatroom |
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| (noun) a private lounge off of a legislative chamber | - |
| clobber | (noun) informal terms for personal possessions | Synonyms: stuff |
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| clochard | (noun) a wanderer who has no established residence or visible means of support | Synonyms: drifter, floater, vagabond, vagrant |
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| cloche | (noun) a woman's close-fitting hat that resembles a helmet | - |
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| (noun) a low transparent cover put over young plants to protect them from cold | - |
| clock | (noun) a timepiece that shows the time of day | - |
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| clocking | (noun) the time taken to traverse a measured course | - |
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| clockmaker | (noun) someone whose occupation is making or repairing clocks and watches | Synonyms: clocksmith |
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| clocks | (noun) European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage | Synonyms: alfilaria, alfileria, Erodium cicutarium, filaree, filaria, pin clover, pin grass, redstem storksbill |
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| clocksmith | (noun) someone whose occupation is making or repairing clocks and watches | Synonyms: clockmaker |
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| clockwork | (noun) any mechanism of geared wheels that is driven by a coiled spring; resembles the works of a mechanical clock | - |
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| clod | (noun) a compact mass | Synonyms: ball, chunk, clump, glob, lump |
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| (noun) an awkward stupid person | Synonyms: gawk, goon, lout, lubber, lummox, lump, oaf, stumblebum |
| clodhopper | (noun) a thick and heavy shoe | Synonyms: brogan, brogue, work shoe |
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| clofibrate | (noun) a drug (trade name Atromid-S) that reduces lipids in the blood serum; used to treat some cardiovascular diseases | Synonyms: Atromid-S |
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| clog | (noun) a dance performed while wearing shoes with wooden soles; has heavy stamping steps | Synonyms: clog dance, clog dancing |
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| (noun) any object that acts as a hindrance or obstruction | - |
| (noun) footwear usually with wooden soles | Synonyms: geta, patten, sabot |
| cloisonne | (noun) enamelware in which colored areas are separated by thin metal strips | - |
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| cloister | (noun) residence that is a place of religious seclusion (such as a monastery) | Synonyms: religious residence |
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| (noun) a courtyard with covered walks (as in religious institutions) | - |
| clomiphene | (noun) a fertility drug (trade name Clomid) that is used to stimulate ovulation and that has been associated with multiple births | Synonyms: Clomid, clomiphene citrate |
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| clomipramine | (noun) a tricyclic antidepressant drug | - |
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| clon | (noun) a group of genetically identical cells or organisms derived from a single cell or individual by some kind of asexual reproduction | Synonyms: clone |
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| clone | (noun) an unauthorized copy or imitation | Synonyms: knockoff |
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| (noun) a group of genetically identical cells or organisms derived from a single cell or individual by some kind of asexual reproduction | Synonyms: clon |
| (noun) a person who is almost identical to another | Synonyms: dead ringer, ringer |
| clonidine | (noun) an antihypertensive (trade name Catapres) that can be administered orally or via transdermal patches | Synonyms: Catapres |
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| cloning | (noun) a general term for the research activity that creates a copy of some biological entity (a gene or organism or cell) | - |
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| clonus | (noun) convulsion characterized by alternating contractions and relaxations | - |
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| clop | (noun) the sound of a horse's hoofs hitting on a hard surface | Synonyms: clip-clop, clippety-clop, clopping, clumping, clunking |
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| clopping | (noun) the sound of a horse's hoofs hitting on a hard surface | Synonyms: clip-clop, clippety-clop, clop, clumping, clunking |
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| close | (noun) the concluding part of any performance | Synonyms: closing curtain, finale, finis |
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| (noun) the last section of a communication | Synonyms: closing, conclusion, end, ending |
| (noun) the temporal end; the concluding time | Synonyms: conclusion, finale, finis, finish, last, stopping point |
| closedown | (noun) termination of operations | Synonyms: closing, closure, shutdown |
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| closeness | (noun) the spatial property resulting from a relatively small distance | Synonyms: nearness |
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| (noun) characterized by a lack of openness (especially about one's actions or purposes) | Synonyms: secretiveness |
| (noun) the quality of being close and poorly ventilated | Synonyms: stuffiness |
| (noun) close or warm friendship | Synonyms: familiarity, intimacy |
| (noun) extreme stinginess | Synonyms: meanness, minginess, niggardliness, niggardness, parsimoniousness, parsimony, tightfistedness, tightness |
| (noun) a feeling of being intimate and belonging together | Synonyms: intimacy |
| closeout | (noun) a sale intended to dispose of all remaining stock | - |
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| closer | (noun) (baseball) a relief pitcher who can protect a lead in the last inning or two of the game | Synonyms: finisher |
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| (noun) a person who closes something | - |
| closet | (noun) a small private room for study or prayer | - |
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| (noun) a toilet in Britain | Synonyms: loo, W.C., water closet |
| (noun) a tall piece of furniture that provides storage space for clothes; has a door and rails or hooks for hanging clothes | Synonyms: press, wardrobe |
| (noun) a small room (or recess) or cabinet used for storage space | Synonyms: cupboard |
| closeup | (noun) a photograph taken at close range | - |
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| closing | (noun) termination of operations | Synonyms: closedown, closure, shutdown |
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| (noun) the act of closing something | Synonyms: shutting |
| (noun) a concluding action | Synonyms: completion, culmination, mop up, windup |
| (noun) approaching a particular destination; a coming closer; a narrowing of a gap | Synonyms: closure |
| (noun) the last section of a communication | Synonyms: close, conclusion, end, ending |
| 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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| closure | (noun) termination of operations | Synonyms: closedown, closing, shutdown |
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| (noun) the act of blocking | Synonyms: blockage, occlusion |
| (noun) approaching a particular destination; a coming closer; a narrowing of a gap | Synonyms: closing |
| (noun) an obstruction in a pipe or tube | Synonyms: block, blockage, occlusion, stop, stoppage |
| (noun) a Gestalt principle of organization holding that there is an innate tendency to perceive incomplete objects as complete and to close or fill gaps and to perceive asymmetric stimuli as symmetric | Synonyms: law of closure |
| (noun) something settled or resolved; the outcome of decision making | Synonyms: resolution, settlement |
| (noun) a rule for limiting or ending debate in a deliberative body | Synonyms: cloture, gag law, gag rule |
| clot | (noun) a lump of material formed from the content of a liquid | Synonyms: coagulum |
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| clotbur | (noun) any of several erect biennial herbs of temperate Eurasia having stout taproots and producing burs | Synonyms: burdock |
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| cloth | (noun) artifact made by weaving or felting or knitting or crocheting natural or synthetic fibers | Synonyms: fabric, material, textile |
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| clothes | (noun) clothing in general | Synonyms: apparel, dress, wearing apparel |
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| clothesbrush | (noun) a brush used for cleaning clothing | - |
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| clotheshorse | (noun) a framework on which to hang clothes (as for drying) | - |
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| (noun) a man who is much concerned with his dress and appearance | Synonyms: beau, dandy, dude, fashion plate, fop, gallant, sheik, swell |
| clothesline | (noun) a cord on which clothes are hung to dry | - |
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| clothespin | (noun) wood or plastic fastener; for holding clothes on a clothesline | Synonyms: clothes peg, clothes pin |
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| clothespress | (noun) a closet where clothes are stored | Synonyms: clothes closet |
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| clothier | (noun) a merchant who sells men's clothing | Synonyms: haberdasher |
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| clothing | (noun) a covering designed to be worn on a person's body | Synonyms: article of clothing, habiliment, vesture, wear, wearable |
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| clotting | (noun) the process of forming semisolid lumps in a liquid | Synonyms: coagulation, curdling |
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| cloture | (noun) a rule for limiting or ending debate in a deliberative body | Synonyms: closure, gag law, gag rule |
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| cloud | (noun) a group of many things in the air or on the ground | Synonyms: swarm |
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| (noun) a visible mass of water or ice particles suspended at a considerable altitude | - |
| (noun) any collection of particles (e.g., smoke or dust) or gases that is visible | - |
| (noun) suspicion affecting your reputation | - |
| (noun) out of touch with reality | - |
| (noun) a cause of worry or gloom or trouble | - |
| cloudberry | (noun) creeping raspberry of north temperate regions with yellow or orange berries | Synonyms: bakeapple, baked-apple berry, dwarf mulberry, Rubus chamaemorus, salmonberry |
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| cloudburst | (noun) a heavy rain | Synonyms: deluge, downpour, pelter, soaker, torrent, waterspout |
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| cloudiness | (noun) the quality of being cloudy | Synonyms: muddiness, murkiness |
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| (noun) the state of the sky when it is covered by clouds | Synonyms: cloud cover, overcast |
| (noun) gloomy semidarkness caused by cloud cover | Synonyms: overcast |
| clouding | (noun) the process whereby water particles become visible in the sky | Synonyms: clouding up |
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| cloudlessness | (noun) the lightness of a sunny day when there are no clouds in the sky | - |
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| clout | (noun) (boxing) a blow with the fist | Synonyms: biff, lick, poke, punch, slug |
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| (noun) a short nail with a flat head; used to attach sheet metal to wood | Synonyms: clout nail |
| (noun) special advantage or influence | Synonyms: pull |
| (noun) a target used in archery | - |
| clove | (noun) spice from dried unopened flower bud of the clove tree; used whole or ground | - |
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| (noun) one of the small bulblets that can be split off of the axis of a larger garlic bulb | Synonyms: garlic clove |
| (noun) moderate sized very symmetrical red-flowered evergreen widely cultivated in the tropics for its flower buds which are source of cloves | Synonyms: clove tree, Eugenia aromaticum, Eugenia caryophyllatum, Syzygium aromaticum |
| (noun) aromatic flower bud of a clove tree; yields a spice | - |
| clover | (noun) a plant of the genus Trifolium | Synonyms: trefoil |
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| cloverleaf | (noun) an interchange that does not require left-hand turns | - |
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| cloveroot | (noun) hairy Eurasian plant with small yellow flowers and an astringent root formerly used medicinally | Synonyms: clover-root, Geum urbanum, herb bennet, wood avens |
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| clowder | (noun) a group of cats | - |
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| clown | (noun) a person who amuses others by ridiculous behavior | Synonyms: buffoon, goof, goofball, merry andrew |
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| (noun) a rude or vulgar fool | Synonyms: buffoon |
| clowning | (noun) acting like a clown or buffoon | Synonyms: buffoonery, frivolity, harlequinade, japery, prank |
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| (noun) a comic incident or series of incidents | Synonyms: comedy, drollery, funniness |
| clozapine | (noun) an antipsychotic drug (trade name Clozaril) used as a sedative and for treatment-resistant schizophrenia; known to have few side effects | Synonyms: Clozaril |
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| cycloalkene | (noun) alkene hydrocarbon which contains a closed ring of carbon atoms, but has no aromatic character. | Synonyms: cycloolefin |
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| cyclobenzaprine | (noun) muscle relaxant (trade name Flexeril) used for muscle spasms or acute injury | Synonyms: Flexeril |
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| cyclohexanol | (noun) a colorless oily alcohol that smells like camphor | - |
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| cycloid | (noun) a line generated by a point on a circle rolling along a straight line | - |
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| cyclone | (noun) a violent rotating windstorm | - |
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| (noun) (meteorology) rapid inward circulation of air masses about a low pressure center; circling counterclockwise in the Northern Hemisphere and clockwise in the southern | - |
| cycloolefin | (noun) alkene hydrocarbon which contains a closed ring of carbon atoms, but has no aromatic character. | Synonyms: cycloalkene |
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| cyclooxygenase | (noun) either of two related enzymes that control the production of prostaglandins and are blocked by aspirin | Synonyms: Cox |
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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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| cyclopropane | (noun) a colorless flammable gas sometimes used as an inhalation anesthetic | - |
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| cyclops | (noun) minute free-swimming freshwater copepod having a large median eye and pear-shaped body and long antennae used in swimming; important in some food chains and as intermediate hosts of parasitic worms that affect man e.g. Guinea worms | Synonyms: water flea |
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| cyclorama | (noun) a picture (or series of pictures) representing a continuous scene | Synonyms: diorama, panorama |
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| cycloserine | (noun) an antibiotic that is especially active against the tubercle bacillus | - |
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| cyclosis | (noun) the circulation of cytoplasm within a cell | Synonyms: streaming |
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| cyclostome | (noun) primitive aquatic vertebrate | - |
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| cyclostyle | (noun) a writing implement with a small toothed wheel that cuts small holes in a stencil | - |
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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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| cyclotron | (noun) an accelerator that imparts energies of several million electron-volts to rapidly moving particles | - |
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| dicloxacillin | (noun) antibacterial (trade name Dynapen) used to treat staphylococcal infections that are resistant to penicillin | Synonyms: Dynapen |
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| disclosure | (noun) the speech act of making something evident | Synonyms: revealing, revelation |
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| dishcloth | (noun) a cloth for washing dishes | Synonyms: dishrag |
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| dustcloth | (noun) a piece of cloth used for dusting | Synonyms: duster, dustrag |
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