| 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 | - |
| 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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| 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 |
| 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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| 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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| 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 | - |
| 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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| 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 | (noun) a design produced by inlaying gold or silver into steel | - |
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| 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 |
| deadline | (noun) the point in time at which something must be completed | - |
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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 |
| 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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| desipramine | (noun) a tricyclic antidepressant drug that activates the psychomotor system | - |
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| dessiatine | (noun) a former Russian unit of area equal to 2.7 acres | - |
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| dexamethasone | (noun) a corticosteroid drug (trade names Decadron or Dexamethasone Intensol or Dexone or Hexadrol or Oradexon) used to treat allergies or inflammation | Synonyms: Decadron, Dexamethasone Intensol, Dexone, Hexadrol, Oradexon |
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| diacetylmorphine | (noun) a narcotic that is considered a hard drug; a highly addictive morphine derivative; intravenous injection provides the fastest and most intense rush | Synonyms: heroin |
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| diamine | (noun) any organic compound containing two amino groups | - |
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| diaphone | (noun) a foghorn that makes a signal consisting of two tones | - |
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| dibucaine | (noun) a local anesthetic that is administered by injection | - |
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| dichlorodiphenyltrichloroethane | (noun) an insecticide that is also toxic to animals and humans; banned in the United States since 1972 | Synonyms: DDT |
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| dichloromethane | (noun) a nonflammable liquid used as a solvent and paint remover and refrigerant | Synonyms: methylene chloride |
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| didanosine | (noun) an antiviral drug used to combat HIV infection, a reverse transcriptase inhibitor | Synonyms: ddI, DDI, dideoxyinosine |
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| dideoxycytosine | (noun) an antiviral drug used to combat HIV infection; a nucleoside analog reverse transcriptase inhibitor (NARTI) | Synonyms: ddC, DDC, zalcitabine |
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| dideoxyinosine | (noun) an antiviral drug used to combat HIV infection, a reverse transcriptase inhibitor | Synonyms: ddI, DDI, didanosine |
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| dihydroxyphenylalanine | (noun) amino acid that is formed in the liver and converted into dopamine in the brain | Synonyms: dopa |
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| diphenhydramine | (noun) antihistamine (trade name Benadryl) used to treat allergic reactions involving the nasal passages (hay fever) and also to treat motion sickness | Synonyms: Benadryl |
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| diplotene | (noun) the fourth stage of the prophase of meiosis | - |
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| discipline | (noun) training to improve strength or self-control | - |
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| (noun) the act of disciplining | Synonyms: correction |
| (noun) the trait of being well behaved | - |
| (noun) a branch of knowledge | Synonyms: bailiwick, field, field of study, study, subject, subject area, subject field |
| (noun) a system of rules of conduct or method of practice | - |
| divine | (noun) a clergyman or other person in religious orders | Synonyms: churchman, cleric, ecclesiastic |
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| doctrine | (noun) a belief (or system of beliefs) accepted as authoritative by some group or school | Synonyms: ism, philosophical system, philosophy, school of thought |
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| dogbane | (noun) any of several poisonous perennial plants of the genus Apocynum having acrid milky juice and bell-shaped white or pink flowers and a very bitter root | - |
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| domine | (noun) a clergyman; especially a settled minister or parson | Synonyms: dominee, dominie, dominus |
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| dopamine | (noun) a monoamine neurotransmitter found in the brain and essential for the normal functioning of the central nervous system; as a drug (trade names Dopastat and Intropin) it is used to treat shock and hypotension | Synonyms: Dopastat, Intropin |
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| doxycycline | (noun) an antibiotic derived from tetracycline that is effective against many infections | Synonyms: Vibramycin |
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| doyenne | (noun) a woman who is the senior member of a group | - |
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| dripstone | (noun) a protective drip that is made of stone | Synonyms: hoodmold, hoodmould |
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| (noun) the form of calcium carbonate found in stalactites and stalagmites | - |
| drone | (noun) stingless male bee in a colony of social bees (especially honeybees) whose sole function is to mate with the queen | - |
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| (noun) a pipe of the bagpipe that is tuned to produce a single continuous tone | Synonyms: bourdon, drone pipe |
| (noun) an aircraft without a pilot that is operated by remote control | Synonyms: pilotless aircraft, radio-controlled aircraft |
| (noun) an unchanging intonation | Synonyms: droning, monotone |
| (noun) someone who takes more time than necessary; someone who lags behind | Synonyms: dawdler, laggard, lagger, poke, trailer |
| dropline | (noun) a headline with the top line flush left and succeeding lines indented to the right | Synonyms: drop line, stagger head, staggered head, stephead, stepped line |
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| dryopithecine | (noun) considered a possible ancestor to both anthropoid apes and humans | - |
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| dune | (noun) a ridge of sand created by the wind; found in deserts or near lakes and oceans | Synonyms: sand dune |
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| dyne | (noun) a unit of force equal to the force that imparts an acceleration of 1 cm/sec/sec to a mass of 1 gram | - |
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| earphone | (noun) electro-acoustic transducer for converting electric signals into sounds; it is held over or inserted into the ear | Synonyms: earpiece, headphone, phone |
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| eglantine | (noun) Eurasian rose with prickly stems and fragrant leaves and bright pink flowers followed by scarlet hips | Synonyms: briar, brier, Rosa eglanteria, sweetbriar, sweetbrier |
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| elecampane | (noun) tall coarse Eurasian herb having daisylike yellow flowers with narrow petals whose rhizomatous roots are used medicinally | Synonyms: Inula helenium |
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| enamine | (noun) an amine containing the double bond linkage -C=C-N- | - |
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| endocrine | (noun) the secretion of an endocrine gland that is transmitted by the blood to the tissue on which it has a specific effect | Synonyms: hormone, internal secretion |
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| (noun) any of the glands of the endocrine system that secrete hormones directly into the bloodstream | Synonyms: ductless gland, endocrine gland |
| enflurane | (noun) a nonflammable liquid (trade name Ethrane) used as an inhalation general anesthetic | Synonyms: Ethrane |
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| engine | (noun) motor that converts thermal energy to mechanical work | - |
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| (noun) a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks | Synonyms: locomotive, locomotive engine, railway locomotive |
| (noun) an instrument or machine that is used in warfare, such as a battering ram, catapult, artillery piece, etc. | - |
| (noun) something used to achieve a purpose | - |
| entryphone | (noun) An intercom system which enables someone, without opening the door, to converse with the person who has rung the doorbell. | - |
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| epergne | (noun) a large table centerpiece with branching holders for fruit or sweets or flowers | - |
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| ephedrine | (noun) white odorless powdered or crystalline alkaloid from plants of the genus Ephedra (especially Ephedra sinica) or made synthetically; used as a bronchodilator to treat bronchitis and asthma | - |
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| epicene | (noun) one having both male and female sexual characteristics and organs; at birth an unambiguous assignment of male or female cannot be made | Synonyms: androgyne, epicene person, gynandromorph, hermaphrodite, intersex |
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| epigone | (noun) an inferior imitator of some distinguished writer, artist, or musician | Synonyms: epigon |
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| epinephrine | (noun) a catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action | Synonyms: Adrenalin, adrenaline, epinephrin |
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| equine | (noun) hoofed mammals having slender legs and a flat coat with a narrow mane along the back of the neck | Synonyms: equid |
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| ergonovine | (noun) an alkaloid derived from ergot (trade name Ergotrate Maleate) that is less toxic than ergot; induces muscular contraction of the uterus and is administered after childbirth or abortion | Synonyms: Ergotrate Maleate |
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| ergotamine | (noun) an alkaloid derived from ergot that is less toxic than ergot; causes constriction of blood vessels and is used to treat migraine | - |
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| ergotine | (noun) a powerful astringent alkaloid extracted from ergot as a brown, amorphous, bitter substance, used to produce contraction of the uterus. | - |
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| ermine | (noun) mustelid of Northern Hemisphere in its white winter coat | Synonyms: Mustela erminea, shorttail weasel |
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| (noun) the expensive white fur of the ermine | - |