| 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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| choline | (noun) a B-complex vitamin that is a constituent of lecithin; essential in the metabolism of fat | - |
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| chopine | (noun) a woman's shoe with a very high thick sole | Synonyms: platform |
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| chordophone | (noun) a stringed instrument of the group including harps, lutes, lyres, and zithers | - |
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| chorine | (noun) a woman who dances in a chorus line | Synonyms: chorus girl, showgirl |
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| cicerone | (noun) a guide who conducts and informs sightseers | - |
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| cimetidine | (noun) a drug (trade name Tagamet) used to treat peptic ulcers by decreasing the secretion of stomach acid | Synonyms: Tagamet |
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| cinchonine | (noun) an alkaloid derivative of the bark of cinchona trees that is used as an antimalarial drug | - |
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| cinnamene | (noun) a colorless oily liquid; the monomer for polystyrene | Synonyms: phenylethylene, styrene, vinylbenzene |
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| cisalpine | (adjective) on the Italian or Roman side of the Alps | Synonyms: ultramontane |
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| cismontane | (adjective) on this (the speaker's) side of the mountains | - |
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| citrine | (noun) semiprecious yellow quartz resembling topaz | - |
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| 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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| clandestine | (adjective) conducted with or marked by hidden aims or methods | Synonyms: cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, secret, surreptitious, undercover, underground |
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| claystone | (noun) fine-grained rock consisting of compacted clay particles | - |
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| clementine | (noun) a mandarin orange of a deep reddish orange color and few seeds | - |
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| (noun) a variety of mandarin orange that is grown around the Mediterranean and in South Africa | Synonyms: clementine tree |
| clingstone | (noun) fruit (especially peach) whose flesh adheres strongly to the pit | Synonyms: cling |
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| cloisonne | (adjective) (for metals) having areas separated by metal and filled with colored enamel and fired | Synonyms: champleve |
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| (noun) enamelware in which colored areas are separated by thin metal strips | - |
| 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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| 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 |
| (verb) make multiple identical copies of | - |
| clonidine | (noun) an antihypertensive (trade name Catapres) that can be administered orally or via transdermal patches | Synonyms: Catapres |
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| clothesline | (noun) a cord on which clothes are hung to dry | - |
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| 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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| coastline | (noun) the outline of a coast | - |
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| cobblestone | (noun) rectangular paving stone with curved top; once used to make roads | Synonyms: cobble, sett |
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| (verb) pave with cobblestones | Synonyms: cobble |
| cocaine | (noun) a narcotic (alkaloid) extracted from coca leaves; used as a surface anesthetic or taken for pleasure; can become powerfully addictive | Synonyms: cocain |
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| codeine | (noun) derivative of opium; used as an antitussive (to relieve coughing) and an analgesic (to relieve pain) | - |
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| coelogyne | (noun) any of various orchids of the genus Coelogyne with: clusters of fragrant lacy snow-white flowers; salmon-pink solitary flowers; chainlike racemes of topaz and chocolate brown flowers; spikes of delicate white spice-scented flowers; emerald green flowers marked with blue-black | - |
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| cohune | (noun) tropical American feather palm whose large nuts yield valuable oil and a kind of vegetable ivory | Synonyms: cohune palm, Orbignya cohune |
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| coigne | (noun) the keystone of an arch | Synonyms: coign, quoin |
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| (noun) expandable metal or wooden wedge used by printers to lock up a form within a chase | Synonyms: coign, quoin |
| colchicine | (noun) an analgesic drug derived from the saffron plant and used to treat gout | - |
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| collarbone | (noun) bone linking the scapula and sternum | Synonyms: clavicle |
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| cologne | (noun) a perfumed liquid made of essential oils and alcohol | Synonyms: cologne water, eau de cologne |
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| columbine | (noun) a plant of the genus Aquilegia having irregular showy spurred flowers; north temperate regions especially mountains | Synonyms: aquilege, aquilegia |
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| combine | (noun) harvester that heads and threshes and cleans grain while moving across the field | - |
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| (noun) an occurrence that results in things being united | Synonyms: combining |
| (noun) a consortium of independent organizations formed to limit competition by controlling the production and distribution of a product or service | Synonyms: cartel, corporate trust, trust |
| (verb) mix together different elements | Synonyms: blend, coalesce, commingle, conflate, flux, fuse, immix, meld, merge, mix |
| (verb) put or add together | Synonyms: compound |
| (verb) combine so as to form a whole; mix | Synonyms: compound |
| (verb) gather in a mass, sum, or whole | Synonyms: aggregate |
| (verb) add together from different sources | - |
| (verb) join for a common purpose or in a common action | - |
| (verb) have or possess in combination | Synonyms: unite |
| comedienne | (noun) a female comedian | - |
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| (noun) a female actor in a comedy | - |
| commune | (noun) a body of people or families living together and sharing everything | - |
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| (noun) the smallest administrative district of several European countries | - |
| (verb) receive Communion, in the Catholic church | Synonyms: communicate |
| (verb) communicate intimately with; be in a state of heightened, intimate receptivity | - |
| compline | (noun) last of the seven canonical hours just before retiring | Synonyms: complin |
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| concubine | (noun) a woman who cohabits with an important man | Synonyms: courtesan, doxy, paramour |
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| condone | (verb) excuse, overlook, or make allowances for; be lenient with | Synonyms: excuse |
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| cone | (noun) any cone-shaped artifact | - |
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| (noun) a visual receptor cell in the retina that is sensitive to bright light and to color | Synonyms: cone cell, retinal cone |
| (noun) cone-shaped mass of ovule- or spore-bearing scales or bracts | Synonyms: strobile, strobilus |
| (noun) a shape whose base is a circle and whose sides taper up to a point | Synonyms: cone shape, conoid |
| (verb) make cone-shaped | - |
| confine | (verb) place limits on (extent or amount or access) | Synonyms: bound, limit, restrict, throttle, trammel |
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| (verb) to close within bounds, or otherwise limit or deprive of free movement | Synonyms: constrain, hold, restrain |
| (verb) prevent from leaving or from being removed | - |
| (verb) deprive of freedom; take into confinement | Synonyms: detain |
| (verb) close in | Synonyms: enclose, hold in |
| consanguine | (adjective) related by blood | Synonyms: akin, blood-related, cognate, consanguineal, consanguineous, kin |
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| contravene | (verb) deny the truth of | Synonyms: contradict, negate |
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| (verb) go against, as of rules and laws | Synonyms: conflict, infringe, run afoul |
| convene | (verb) call together | Synonyms: convoke |
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| (verb) meet formally | - |
| copaline | (noun) partly mineralized copal dug from the ground | Synonyms: copalite, fossil copal |
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| copestone | (noun) a stone that forms the top of wall or building | Synonyms: capstone, coping stone, stretcher |
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| (noun) a final touch; a crowning achievement; a culmination | Synonyms: capstone, finishing touch |
| cornerstone | (noun) a stone at the outer corner of two intersecting masonry walls | - |
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| (noun) a stone in the exterior of a large and important building; usually carved with a date and laid with appropriate ceremonies | - |
| (noun) the fundamental assumptions from which something is begun or developed or calculated or explained | Synonyms: base, basis, foundation, fundament, groundwork |
| cornpone | (noun) cornbread often made without milk or eggs and baked or fried (southern) | Synonyms: pone |
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| corticosterone | (noun) secreted by the adrenal cortex; involved in regulating water and electrolyte balance in the body | - |
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| cortisone | (noun) a corticosteroid hormone (trade name Cortone Acetate) normally produced by the adrenal cortex; is converted to hydrocortisone | Synonyms: Cortone Acetate |
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| corvine | (adjective) relating to or resembling a crow | - |
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| cosine | (noun) ratio of the adjacent side to the hypotenuse of a right-angled triangle | Synonyms: cos |
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| coumarone | (noun) a colorless oily compound extracted from coal tar and used in manufacturing synthetic resins | Synonyms: benzofuran, cumarone |
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| countermine | (noun) (military) a tunnel dug to defeat similar activities by the enemy | - |
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| (verb) destroy enemy mines with one's own mines | - |
| (verb) destroy property or hinder normal operations | Synonyms: counteract, sabotage, subvert, undermine, weaken |
| counterpane | (noun) decorative cover for a bed | Synonyms: bed cover, bed covering, bedcover, bedspread, spread |
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| crane | (noun) large long-necked wading bird of marshes and plains in many parts of the world | - |
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| (noun) lifts and moves heavy objects; lifting tackle is suspended from a pivoted boom that rotates around a vertical axis | - |
| (verb) stretch (the neck) so as to see better | Synonyms: stretch out |
| creatine | (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: creatin |
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| cretonne | (noun) an unglazed heavy fabric; brightly printed; used for slipcovers and draperies | - |
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| crinoline | (noun) a stiff coarse fabric used to stiffen hats or clothing | - |
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| (noun) a full stiff petticoat made of crinoline fabric | - |
| (noun) a skirt stiffened with hoops | Synonyms: hoopskirt |
| cromorne | (noun) a Renaissance woodwind with a double reed and a curving tube (crooked horn) | Synonyms: crumhorn, krummhorn |
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| crone | (noun) an ugly evil-looking old woman | Synonyms: beldam, beldame, hag, witch |
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| cryptocoryne | (noun) any plant of the genus Cryptocoryne; evergreen perennials growing in fresh or brackish water; tropical Asia | Synonyms: water trumpet |
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| crystalline | (adjective) consisting of or containing or of the nature of crystals | - |
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| (adjective) transmitting light; able to be seen through with clarity | Synonyms: crystal clear, limpid, lucid, pellucid, transparent |
| (adjective) distinctly or sharply outlined | - |
| ctene | (noun) a locomotor organ consisting of a row of strong cilia whose bases are fused | Synonyms: comb-plate |
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| cuisine | (noun) the practice or manner of preparing food or the food so prepared | Synonyms: culinary art |
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| cumarone | (noun) a colorless oily compound extracted from coal tar and used in manufacturing synthetic resins | Synonyms: benzofuran, coumarone |
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| curbstone | (noun) a paving stone forming part of a curb | Synonyms: kerbstone |
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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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| 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 | - |
| cyclopropane | (noun) a colorless flammable gas sometimes used as an inhalation anesthetic | - |
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| cycloserine | (noun) an antibiotic that is especially active against the tubercle bacillus | - |
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| cymene | (noun) any of three isotopes of a colorless aromatic liquid hydrocarbon occurring in the volatile oil of cumin and thyme and used in the manufacture of synthetic resins | - |
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| cyproheptadine | (noun) an antihistamine (trade name Periactin) used to treat some allergic reactions | Synonyms: Periactin |
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| cysteine | (noun) an amino acid containing sulfur that is found in most proteins; oxidizes on exposure to air to form cystine | - |
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| cystine | (noun) a crystalline amino acid found in proteins (especially keratin); discovered in bladder stones | - |
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| cytidine | (noun) a nucleoside component of DNA; composed of cytosine and deoxyribose | Synonyms: deoxycytidine |
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| cytokine | (noun) any of various protein molecules secreted by cells of the immune system that serve to regulate the immune system | - |
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| cytomembrane | (noun) a thin membrane (a double layer of lipids) enclosing the cytoplasm of a cell; proteins in the membrane control passage of ions (like sodium or potassium or calcium) in and out of the cell | Synonyms: cell membrane, plasma membrane |
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| cytosine | (noun) a base found in DNA and RNA and derived from pyrimidine; pairs with guanine | Synonyms: C |
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| damascene | (adjective) of or relating to or characteristic of Damascus or its people | - |
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| (adjective) (of metals) decorated or inlaid with a wavy pattern of different (especially precious) metals | - |
| (noun) a design produced by inlaying gold or silver into steel | - |
| (verb) inlay metal with gold and silver | - |
| daphne | (noun) any of several ornamental shrubs with shiny mostly evergreen leaves and clusters of small bell-shaped flowers | - |
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| dapsone | (noun) antibacterial drug used to treat leprosy and some kinds of skin diseases | - |
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| dateline | (noun) a line at the beginning of a news article giving the date and place of origin of the news dispatch | - |
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| (noun) an imaginary line on the surface of the earth following (approximately) the 180th meridian | Synonyms: date line, International Date Line |
| (verb) mark with a date and place | Synonyms: date-mark, datemark |
| deadline | (noun) the point in time at which something must be completed | - |
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| debone | (verb) remove the bones from | Synonyms: bone |
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| decline | (noun) a downward slope or bend | Synonyms: declension, declination, declivity, descent, downslope, fall |
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| (noun) a gradual decrease; as of stored charge or current | Synonyms: decay |
| (noun) change toward something smaller or lower | Synonyms: diminution |
| (noun) a condition inferior to an earlier condition; a gradual falling off from a better state; decline | Synonyms: declination |
| (verb) grow smaller | Synonyms: go down, wane |
| (verb) grow worse | Synonyms: worsen |
| (verb) show unwillingness towards | Synonyms: refuse |
| (verb) inflect for number, gender, case, etc. | - |
| (verb) go down | - |
| (verb) fall in value | Synonyms: correct, slump |
| (verb) not accept as true | Synonyms: pass up, refuse, reject, turn down |
| define | (verb) give a definition for the meaning of a word | - |
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| (verb) decide upon or fix definitely | Synonyms: determine, fix, limit, set, specify |
| (verb) determine the essential quality of | Synonyms: delimit, delimitate, delineate, specify |
| (verb) determine the nature of | - |
| (verb) show the form or outline of | Synonyms: delineate |
| delavirdine | (noun) a non-nucleoside reverse transcriptase inhibitor (trade name Rescriptor) used to treat AIDS and HIV | Synonyms: Rescriptor |
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| demesne | (noun) territory over which rule or control is exercised | Synonyms: domain, land |
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| (noun) extensive landed property (especially in the country) retained by the owner for his own use | Synonyms: acres, estate, land, landed estate |
| demimondaine | (noun) a female prostitute | - |
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| dentine | (noun) bone (calcified tissue) surrounding the pulp cavity of a tooth | Synonyms: dentin |
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| (noun) a calcareous material harder and denser than bone that comprises the bulk of a tooth | Synonyms: dentin |
| deoxyadenosine | (noun) a nucleoside component of DNA; composed of adenosine and deoxyribose | - |
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| deoxycytidine | (noun) a nucleoside component of DNA; composed of cytosine and deoxyribose | Synonyms: cytidine |
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| deoxyephedrine | (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: chalk, chicken feed, crank, glass, ice, meth, methamphetamine, methamphetamine hydrochloride, Methedrine, shabu, trash |
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| deoxyguanosine | (noun) a nucleoside component of DNA; composed of guanine and deoxyribose | Synonyms: guanosine |
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| deoxythymidine | (noun) a nucleoside component of DNA; composed of thymine and deoxyribose | Synonyms: thymidine |
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| deplane | (verb) get off an airplane | - |
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