| counterrevolution | (noun) a revolution whose aim is to reverse the changes introduced by a previous revolution | - |
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| countersign | (noun) a second confirming signature endorsing a document already signed | Synonyms: countersignature |
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| (noun) a secret word or phrase known only to a restricted group | Synonyms: parole, password, watchword, word |
| counterstain | (noun) a stain of contrasting color that is used when the principal stain does not show the structure clearly | - |
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| countersubversion | (noun) the aspect of counterintelligence designed to detect and prevent subversive activities | - |
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| counterwoman | (noun) a female who attends a counter (as in a diner) | - |
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| countryman | (noun) a man from your own country | - |
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| (noun) a man who lives in the country and has country ways | Synonyms: ruralist |
| countrywoman | (noun) a woman from your own country | - |
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| (noun) a woman who lives in the country and has country ways | - |
| coupon | (noun) a test sample of some substance | - |
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| (noun) a negotiable certificate that can be detached and redeemed as needed | Synonyms: voucher |
| courlan | (noun) wading bird of South America and Central America | Synonyms: Aramus guarauna |
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| courtesan | (noun) a woman who cohabits with an important man | Synonyms: concubine, doxy, paramour |
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| cousin | (noun) the child of your aunt or uncle | Synonyms: cousin-german, first cousin, full cousin |
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| covariation | (noun) (statistics) correlated variation | - |
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| coven | (noun) an assembly of witches; usually 13 witches | - |
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| cowbarn | (noun) a barn for cows | Synonyms: byre, cow barn, cowhouse, cowshed |
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| cowman | (noun) a male hired hand who tends cattle and performs other duties on horseback | Synonyms: cattleman, cowboy |
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| cowskin | (noun) leather made from the hide of a cow | Synonyms: cowhide |
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| cowtown | (noun) a small town in a cattle-raising area of western North America | Synonyms: cow town |
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| coxswain | (noun) the helmsman of a ship's boat or a racing crew | Synonyms: cox |
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| crackdown | (noun) severely repressive actions | - |
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| cracksman | (noun) a thief who breaks open safes to steal valuable contents | Synonyms: safebreaker, safecracker |
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| craftsman | (noun) a skilled worker who practices some trade or handicraft | Synonyms: artificer, artisan, journeyman |
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| (noun) a creator of great skill in the manual arts | Synonyms: crafter |
| (noun) a professional whose work is consistently of high quality | - |
| cragsman | (noun) a climber of vertical rock faces | Synonyms: rock climber |
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| crampon | (noun) an iron spike attached to the shoe to prevent slipping on ice when walking or climbing | Synonyms: climber, climbing iron, crampoon |
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| (noun) a hinged pair of curved iron bars; used to raise heavy objects | Synonyms: crampoon |
| crampoon | (noun) an iron spike attached to the shoe to prevent slipping on ice when walking or climbing | Synonyms: climber, climbing iron, crampon |
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| (noun) a hinged pair of curved iron bars; used to raise heavy objects | Synonyms: crampon |
| cran | (noun) a capacity unit used for measuring fresh herring | - |
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| craton | (noun) the part of a continent that is stable and forms the central mass of the continent; typically Precambrian | - |
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| craven | (noun) an abject coward | Synonyms: poltroon, recreant |
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| crayon | (noun) writing implement consisting of a colored stick of composition wax used for writing and drawing | Synonyms: wax crayon |
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| creatin | (noun) an amino acid that does not occur in proteins but is found in the muscle tissue of vertebrates both in the free form and as phosphocreatine; supplies energy for muscle contraction | Synonyms: creatine |
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| creation | (noun) the human act of creating | Synonyms: creative activity |
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| (noun) the act of starting something for the first time; introducing something new | Synonyms: foundation, founding, initiation, innovation, instauration, institution, introduction, origination |
| (noun) an artifact that has been brought into existence by someone | - |
| (noun) the event that occurred at the beginning of something | Synonyms: conception |
| (noun) everything that exists anywhere | Synonyms: cosmos, existence, macrocosm, universe, world |
| cremation | (noun) the incineration of a dead body | - |
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| crenation | (noun) one of a series of rounded projections (or the notches between them) formed by curves along an edge (as the edge of a leaf or piece of cloth or the margin of a shell or a shriveled red blood cell observed in a hypertonic solution etc.) | Synonyms: crenature, crenel, crenelle, scallop |
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| crenelation | (noun) the action of constructing ramparts with gaps for firing guns or arrows | Synonyms: crenellation |
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| (noun) a rampart built around the top of a castle with regular gaps for firing arrows or guns | Synonyms: battlement, crenellation |
| crenellation | (noun) the action of constructing ramparts with gaps for firing guns or arrows | Synonyms: crenelation |
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| (noun) a rampart built around the top of a castle with regular gaps for firing arrows or guns | Synonyms: battlement, crenelation |
| crepitation | (noun) the sharp sound of snapping noises | Synonyms: crackle, crackling |
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| cretin | (noun) a person of subnormal intelligence | Synonyms: changeling, half-wit, idiot, imbecile, moron, retard |
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| crewman | (noun) a member of a work crew | - |
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| (noun) a member of a flight crew | Synonyms: crew member |
| (noun) any member of a ship's crew | Synonyms: sailor |
| criminalisation | (noun) legislation that makes something illegal | Synonyms: criminalization |
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| criminalization | (noun) legislation that makes something illegal | Synonyms: criminalisation |
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| crimson | (noun) a deep and vivid red color | Synonyms: deep red, ruby |
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| crinion | (noun) point where the hairline meets the midpoint of the forehead | Synonyms: trichion |
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| criterion | (noun) the ideal in terms of which something can be judged | Synonyms: standard |
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| (noun) a basis for comparison; a reference point against which other things can be evaluated | Synonyms: measure, standard, touchstone |
| crocodilian | (noun) extant archosaurian reptile | Synonyms: crocodilian reptile |
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| crossopterygian | (noun) any fish of the order Crossopterygii; most known only in fossil form | Synonyms: lobe-finned fish, lobefin |
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| crotaphion | (noun) the tip of the greater wing of the sphenoid bone | - |
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| croton | (noun) tropical Asiatic shrub; source of croton oil | Synonyms: Croton tiglium |
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| (noun) grown in many varieties for their brightly colored foliage; widely cultivated as a houseplant | Synonyms: Codiaeum variegatum |
| crouton | (noun) a small piece of toasted or fried bread; served in soup or salads | - |
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| crown | (noun) the part of a hat (the vertex) that covers the crown of the head | - |
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| (noun) an ornamental jeweled headdress signifying sovereignty | Synonyms: diadem |
| (noun) a wreath or garland worn on the head to signify victory | - |
| (noun) the center of a cambered road | Synonyms: crest |
| (noun) (dentistry) dental appliance consisting of an artificial crown for a broken or decayed tooth | Synonyms: cap, crownwork, jacket, jacket crown |
| (noun) the part of a tooth above the gum that is covered with enamel | - |
| (noun) the top of the head | Synonyms: pate, poll |
| (noun) the award given to the champion | Synonyms: pennant |
| (noun) the top or extreme point of something (usually a mountain or hill) | Synonyms: crest, peak, summit, tip, top |
| (noun) the upper branches and leaves of a tree or other plant | Synonyms: treetop |
| (noun) an English coin worth 5 shillings | - |
| crucifixion | (noun) the act of executing by a method widespread in the ancient world; the victim's hands and feet are bound or nailed to a cross | - |
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| (noun) the infliction of extremely painful punishment or suffering | Synonyms: excruciation |
| crumhorn | (noun) a Renaissance woodwind with a double reed and a curving tube (crooked horn) | Synonyms: cromorne, krummhorn |
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| crustacean | (noun) any mainly aquatic arthropod usually having a segmented body and chitinous exoskeleton | - |
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| cryogen | (noun) a liquid that boils at below -160 C and is used as a refrigerant | - |
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| crystallisation | (noun) the formation of crystals | Synonyms: crystallization, crystallizing |
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| crystallization | (noun) a mental synthesis that becomes fixed or concrete by a process resembling crystal formation | - |
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| (noun) a rock formed by the solidification of a substance; has regularly repeating internal structure; external plane faces | Synonyms: crystal |
| (noun) the formation of crystals | Synonyms: crystallisation, crystallizing |
| crystallogen | (noun) any chemical element that belongs to the carbon group. | Synonyms: carbon group element, Group 14 element, tetragen, tetrel |
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| culmination | (noun) a concluding action | Synonyms: closing, completion, mop up, windup |
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| (noun) the decisive moment in a novel or play | Synonyms: climax |
| (noun) (astronomy) a heavenly body's highest celestial point above an observer's horizon | - |
| (noun) a final climactic stage | Synonyms: apogee |
| cultivation | (noun) (agriculture) production of food by preparing the land to grow crops (especially on a large scale) | - |
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| (noun) socialization through training and education to develop one's mind or manners | - |
| (noun) the act of raising or growing plants (especially on a large scale) | - |
| (noun) the process of fostering the growth of something | - |
| (noun) a highly developed state of perfection; having a flawless or impeccable quality | Synonyms: culture, finish, polish, refinement |
| culverin | (noun) a medieval musket | - |
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| (noun) a heavy cannon with a long barrel used in the 16th and 17th centuries | - |
| cumin | (noun) aromatic seeds of the cumin herb of the carrot family | Synonyms: cumin seed |
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| (noun) dwarf Mediterranean annual long cultivated for its aromatic seeds | Synonyms: Cuminum cyminum |
| cumulation | (noun) a collection of objects laid on top of each other | Synonyms: agglomerate, cumulus, heap, mound, pile |
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| cunctation | (noun) the act of procrastinating; putting off or delaying or deferring an action to a later time | Synonyms: procrastination, shillyshally |
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| curmudgeon | (noun) a crusty irascible cantankerous old person full of stubborn ideas | - |
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| curtain | (noun) hanging cloth used as a blind (especially for a window) | Synonyms: drape, drapery, mantle, pall |
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| (noun) any barrier to communication or vision | - |
| cushion | (noun) a soft bag filled with air or a mass of padding such as feathers or foam rubber etc. | - |
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| (noun) a mechanical damper; absorbs energy of sudden impulses | Synonyms: shock, shock absorber |
| (noun) the layer of air that supports a hovercraft or similar vehicle | - |
| cuspidation | (noun) a decoration using cusps | - |
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| custodian | (noun) one having charge of buildings or grounds or animals | Synonyms: keeper, steward |
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| cutin | (noun) (biochemistry) a waxy transparent material that occurs in the cuticle of plants and consists of highly polymerized esters of fatty acids | - |
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| cyan | (noun) a primary subtractive color for light; has a blue-green color | - |
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| cyanocobalamin | (noun) a B vitamin that is used to treat pernicious anemia | Synonyms: antipernicious anemia factor, cobalamin, vitamin B12 |
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| cyanogen | (noun) a colorless toxic gas with a pungent almond odor; has been used in chemical warfare | - |
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| cyanohydrin | (noun) any organic compound in which the cyano radical -CN and the hydroxyl radical -OH are attached to the same carbon atom | - |
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| cybernation | (noun) the control of processes by computer | Synonyms: computerization |
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| cyclamen | (noun) Mediterranean plant widely cultivated as a houseplant for its showy dark green leaves splotched with silver and nodding white or pink to reddish flowers with reflexed petals | Synonyms: Cyclamen purpurascens |
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| cycloolefin | (noun) alkene hydrocarbon which contains a closed ring of carbon atoms, but has no aromatic character. | Synonyms: cycloalkene |
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| cyclotron | (noun) an accelerator that imparts energies of several million electron-volts to rapidly moving particles | - |
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| cyprian | (noun) a woman who engages in sexual intercourse for money | Synonyms: bawd, cocotte, fancy woman, harlot, lady of pleasure, prostitute, sporting lady, tart, whore, woman of the street, working girl |
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| cytokinin | (noun) any of a class of plant hormones that promote cell division and delay the senescence of leaves | Synonyms: kinin |
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| cytolysin | (noun) a substance that partly or completely destroys animal cells | - |
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| cytoskeleton | (noun) a microscopic network of actin filaments and microtubules in the cytoplasm of many living cells that gives the cell shape and coherence | - |
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| cytotoxin | (noun) any substance that has a toxic effect on cells | - |
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| dacryon | (noun) the craniometric point at the junction of the anterior border of the lacrimal bone with the frontal bone | - |
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| daemon | (noun) an evil supernatural being | Synonyms: daimon, demon, devil, fiend |
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| (noun) a person who is part mortal and part god | Synonyms: demigod |
| daikon | (noun) radish of Japan with a long hard durable root eaten raw or cooked | Synonyms: Japanese radish, radish, Raphanus sativus longipinnatus |
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| daimon | (noun) an evil supernatural being | Synonyms: daemon, demon, devil, fiend |
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| dairyman | (noun) the owner or manager of a dairy | Synonyms: dairy farmer |
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| (noun) a man who works in a dairy | - |
| dalesman | (noun) a person who lives in the dales of northern England | - |
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| dalmatian | (noun) a large breed having a smooth white coat with black or brown spots; originated in Dalmatia | Synonyms: carriage dog, coach dog |
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| damn | (noun) something of little value | Synonyms: darn, hoot, red cent, shit, shucks, tinker's dam, tinker's damn |
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| damnation | (noun) the act of damning | - |
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| (noun) the state of being condemned to eternal punishment in Hell | Synonyms: eternal damnation |
| damson | (noun) dark purple plum of the damson tree | Synonyms: damson plum |
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| dandelion | (noun) any of several herbs of the genus Taraxacum having long tap roots and deeply notched leaves and bright yellow flowers followed by fluffy seed balls | Synonyms: blowball |
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| darn | (noun) sewing that repairs a worn or torn hole (especially in a garment) | Synonyms: mend, patch |
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| (noun) something of little value | Synonyms: damn, hoot, red cent, shit, shucks, tinker's dam, tinker's damn |
| dasheen | (noun) tropical starchy tuberous root | Synonyms: cocoyam, edda, taro, taro root |
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| (noun) herb of the Pacific islands grown throughout the tropics for its edible root and in temperate areas as an ornamental for its large glossy leaves | Synonyms: Colocasia esculenta, dalo, taro, taro plant |
| (noun) edible starchy tuberous root of taro plants | Synonyms: cocoyam, eddo, taro |
| dauphin | (noun) formerly, the eldest son of the King of France and direct heir to the throne | - |
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| dawn | (noun) the earliest period | Synonyms: morning |
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| (noun) the first light of day | Synonyms: aurora, break of day, break of the day, cockcrow, dawning, daybreak, dayspring, first light, morning, sunrise, sunup |
| (noun) an opening time period | - |
| deacon | (noun) a cleric ranking just below a priest in Christian churches; one of the Holy Orders | - |
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| (noun) a Protestant layman who assists the minister | Synonyms: Protestant deacon |
| deactivation | (noun) the act of deactivating or making ineffective (as a bomb) | Synonyms: defusing |
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| (noun) breaking up a military unit (by transfers or discharges) | Synonyms: inactivation |
| deamination | (noun) removal of the amino radical from an amino acid or other amino compound | Synonyms: deaminization |
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| deaminization | (noun) removal of the amino radical from an amino acid or other amino compound | Synonyms: deamination |
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| dean | (noun) an administrator in charge of a division of a university or college | - |
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| (noun) (Roman Catholic Church) the head of the College of Cardinals | - |
| (noun) a man who is the senior member of a group | Synonyms: doyen |