| cosmotron | (noun) a large proton synchrotron; uses frequency modulation of an electric field to accelerate protons | - |
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| cotilion | (noun) a lively dance originating in France in the 18th century | Synonyms: cotillion |
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| (noun) a ball at which young ladies are presented to society | Synonyms: cotillion |
| cotillion | (noun) a lively dance originating in France in the 18th century | Synonyms: cotilion |
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| (noun) a ball at which young ladies are presented to society | Synonyms: cotilion |
| cotton | (noun) fabric woven from cotton fibers | - |
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| (noun) thread made of cotton fibers | - |
| (noun) erect bushy mallow plant or small tree bearing bolls containing seeds with many long hairy fibers | Synonyms: cotton plant |
| (noun) soft silky fibers from cotton plants in their raw state | Synonyms: cotton fiber, cotton wool |
| (verb) take a liking to | - |
| cotyledon | (noun) embryonic leaf in seed-bearing plants | Synonyms: seed leaf |
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| counteraction | (noun) action intended to nullify the effects of some previous action | Synonyms: neutralisation, neutralization |
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| counterattraction | (noun) a rival attraction | - |
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| counterdemonstration | (noun) a demonstration held in opposition to another demonstration | - |
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| counterperson | (noun) someone who attends a counter (as in a diner) | - |
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| counterpoison | (noun) a remedy that stops or controls the effects of a poison | Synonyms: antidote |
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| counterreformation | (noun) a reformation intended to counter the results of a prior reformation | - |
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| counterrevolution | (noun) a revolution whose aim is to reverse the changes introduced by a previous revolution | - |
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| countersubversion | (noun) the aspect of counterintelligence designed to detect and prevent subversive activities | - |
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| 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 |
| covariation | (noun) (statistics) correlated variation | - |
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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 |
| craton | (noun) the part of a continent that is stable and forms the central mass of the continent; typically Precambrian | - |
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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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| (verb) write, draw, or trace with a crayon | - |
| 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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| cresson | (adjective) of a moderate yellow-green color that is greener and deeper than moss green and yellower and darker than pea green | Synonyms: cress green, watercress |
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| 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 | (adjective) characterized by violence or bloodshed | Synonyms: red, violent |
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| (adjective) of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies | Synonyms: blood-red, carmine, cerise, cherry-red, cherry, red, reddish, ruby-red, ruby, ruddy, scarlet |
| (adjective) (especially of the face) reddened or suffused with or as if with blood from emotion or exertion | Synonyms: flushed, red-faced, red, reddened |
| (noun) a deep and vivid red color | Synonyms: deep red, ruby |
| (verb) turn red, as if in embarrassment or shame | Synonyms: blush, flush, redden |
| 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 |
| croon | (verb) sing softly | - |
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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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| 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 |
| 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 |
| 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 |
| 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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| 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 | - |
| (verb) protect from impact | Synonyms: buffer, soften |
| cuspidation | (noun) a decoration using cusps | - |
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| cybernation | (noun) the control of processes by computer | Synonyms: computerization |
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| cyclotron | (noun) an accelerator that imparts energies of several million electron-volts to rapidly moving particles | - |
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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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| 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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| 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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| deaccession | (verb) sell (art works) from a collection, especially in order to raise money for the purchase of other art works | - |
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| 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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| debarkation | (noun) the act of passengers and crew getting off of a ship or aircraft | Synonyms: disembarkation, disembarkment |
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| debilitation | (noun) serious weakening and loss of energy | Synonyms: enervation, enfeeblement, exhaustion |
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| decagon | (noun) a polygon with 10 sides and 10 angles | - |
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| decahedron | (noun) any polyhedron having ten plane faces | - |
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| decalcification | (noun) loss of calcium from bones or teeth | - |
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| decantation | (noun) the act of gently pouring off a clear liquor (as from its original bottle) without disturbing the lees | - |
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| decapitation | (noun) killing by cutting off the head | Synonyms: beheading |
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| (noun) execution by cutting off the victim's head | Synonyms: beheading |
| decarboxylation | (noun) the process of removing a carboxyl group from a chemical compound (usually replacing it with hydrogen) | - |
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| decathlon | (noun) an athletic contest consisting of ten different events | - |
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| deceleration | (noun) the act of decelerating; decreasing the speed | - |
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| (noun) a decrease in rate of change | Synonyms: retardation, slowing |
| (noun) (physics) a rate of decrease in velocity | - |
| decentalisation | (noun) the social process in which population and industry moves from urban centers to outlying districts | Synonyms: decentralization |
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| decentralisation | (noun) the spread of power away from the center to local branches or governments | Synonyms: decentralization |
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| decentralization | (noun) the spread of power away from the center to local branches or governments | Synonyms: decentralisation |
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| (noun) the social process in which population and industry moves from urban centers to outlying districts | Synonyms: decentalisation |
| decentration | (noun) Jean Piaget's theory of cognitive development where a child slowly moves away from an egocentric world to a world shared with others. | Synonyms: decentering |
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| deception | (noun) the act of deceiving | Synonyms: deceit, dissembling, dissimulation |
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| (noun) an illusory feat; considered magical by naive observers | Synonyms: conjuration, conjuring trick, illusion, legerdemain, magic, magic trick, thaumaturgy, trick |
| (noun) a misleading falsehood | Synonyms: deceit, misrepresentation |
| decimalisation | (noun) the act of changing to a decimal system | Synonyms: decimalization |
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| decimalization | (noun) the act of changing to a decimal system | Synonyms: decimalisation |
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| decimation | (noun) destroying or killing a large part of the population | - |
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| decision | (noun) the act of making up your mind about something | Synonyms: conclusion, determination |
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| (noun) the trait of resoluteness as evidenced by firmness of character or purpose | Synonyms: decisiveness |
| (noun) a position or opinion or judgment reached after consideration | Synonyms: conclusion, determination |
| (noun) the outcome of a game or contest | - |
| (noun) (boxing) a victory won on points when no knockout has occurred | - |
| declamation | (noun) vehement oratory | - |
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| (noun) recitation of a speech from memory with studied gestures and intonation as an exercise in elocution or rhetoric | - |
| declaration | (noun) a statement that is emphatic and explicit (spoken or written) | - |
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| (noun) a formal expression by a meeting; agreed to by a vote | Synonyms: resolution, resolve |
| (noun) (law) unsworn statement that can be admitted in evidence in a legal transaction | - |
| (noun) a formal public statement | Synonyms: announcement, annunciation, proclamation |
| (noun) (contract bridge) the highest bid becomes the contract setting the number of tricks that the bidder must make | Synonyms: contract |
| (noun) a statement of taxable goods or of dutiable properties | - |
| declassification | (noun) reduction or removal by the government of restrictions on a classified document or weapon | - |
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| declension | (noun) a class of nouns or pronouns or adjectives in Indo-European languages having the same (or very similar) inflectional forms | - |
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| (noun) a downward slope or bend | Synonyms: declination, decline, declivity, descent, downslope, fall |
| (noun) process of changing to an inferior state | Synonyms: decline in quality, deterioration, worsening |
| (noun) the inflection of nouns and pronouns and adjectives in Indo-European languages | - |
| declination | (noun) a polite refusal of an invitation | Synonyms: regrets |
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| (noun) (astronomy) the angular distance of a celestial body north or to the south of the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere | Synonyms: celestial latitude, dec |
| (noun) a downward slope or bend | Synonyms: declension, decline, declivity, descent, downslope, fall |
| (noun) a condition inferior to an earlier condition; a gradual falling off from a better state; decline | Synonyms: decline |
| decoction | (noun) (pharmacology) the extraction of water-soluble drug substances by boiling | - |
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| decolonisation | (noun) the action of changing from colonial to independent status | Synonyms: decolonization |
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| decolonization | (noun) the action of changing from colonial to independent status | Synonyms: decolonisation |
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| decommission | (verb) withdraw from active service | - |
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| decomposition | (noun) the analysis of a vector field | Synonyms: vector decomposition |
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| (noun) the organic phenomenon of rotting | Synonyms: decay |
| (noun) (biology) the process of decay caused by bacterial or fungal action | Synonyms: breakdown, putrefaction, rot, rotting |
| (noun) (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance | Synonyms: breakdown, chemical decomposition reaction, decomposition reaction |
| (noun) in a decomposed state | Synonyms: disintegration |
| decompression | (noun) relieving pressure (especially bringing a compressed person gradually back to atmospheric pressure) | Synonyms: decompressing |
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| (noun) restoring compressed information to its normal form for use or display | - |
| deconstruction | (noun) a philosophical theory of criticism (usually of literature or film) that seeks to expose deep-seated contradictions in a work by delving below its surface meaning | Synonyms: deconstructionism |
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| decontamination | (noun) the removal of contaminants | - |
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| decoration | (noun) the act of decorating something (in the hope of making it more attractive) | - |
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| (noun) something used to beautify | Synonyms: ornament, ornamentation |
| (noun) an award for winning a championship or commemorating some other event | Synonyms: laurel wreath, medal, medallion, palm, ribbon |
| decortication | (noun) removal of the outer covering of an organ or part | - |
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| decrementation | (noun) the operation of subtracting one from the operand. | - |
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| decrepitation | (noun) the crackling or breaking up of certain crystals when they are heated | - |
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| decriminalisation | (noun) legislation that makes something legal that was formerly illegal | Synonyms: decriminalization |
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| decriminalization | (noun) legislation that makes something legal that was formerly illegal | Synonyms: decriminalisation |
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| decryption | (noun) the activity of making clear or converting from code into plain text | Synonyms: decipherment, decoding |
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| decussation | (noun) an intersection or crossing of two tracts in the form of the letter X | Synonyms: chiasm, chiasma |
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