| depone | (verb) make a deposition; declare under oath | Synonyms: depose, swear |
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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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| destine | (verb) design or destine | Synonyms: designate, intend, specify |
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| (verb) decree or designate beforehand | Synonyms: designate, doom, fate |
| determine | (verb) reach, make, or come to a decision about something | Synonyms: decide, make up one's mind |
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| (verb) fix conclusively or authoritatively | Synonyms: set |
| (verb) shape or influence; give direction to | Synonyms: influence, mold, mould, regulate, shape |
| (verb) fix in scope; fix the boundaries of | - |
| (verb) establish after a calculation, investigation, experiment, survey, or study | Synonyms: ascertain, find, find out |
| (verb) find out, learn, or determine with certainty, usually by making an inquiry or other effort | Synonyms: ascertain, check, find out, learn, see, watch |
| (verb) decide upon or fix definitely | Synonyms: define, fix, limit, set, specify |
| (verb) settle conclusively; come to terms | Synonyms: settle, square off, square up |
| dethrone | (verb) remove a monarch from the throne | - |
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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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| diamantine | (adjective) consisting of diamonds or resembling diamonds | - |
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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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| dine | (verb) have supper; eat dinner | - |
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| (verb) give dinner to; host for dinner | - |
| 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 | - |
| (verb) punish in order to gain control or enforce obedience | Synonyms: correct, sort out |
| (verb) develop (a child's or animal's) behavior by instruction and practice; especially to teach self-control | Synonyms: check, condition, train |
| disincline | (verb) make unwilling | Synonyms: indispose |
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| divine | (adjective) being of such surpassing excellence as to suggest inspiration by the gods | Synonyms: elysian, inspired |
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| (adjective) emanating from God | Synonyms: godly |
| (adjective) devoted to or in the service or worship of a deity | - |
| (adjective) appropriate to or befitting a god | Synonyms: godlike |
| (adjective) being or having the nature of a god | Synonyms: godlike |
| (adjective) resulting from divine providence | Synonyms: providential |
| (noun) a clergyman or other person in religious orders | Synonyms: churchman, cleric, ecclesiastic |
| (verb) search by divining, as if with a rod | - |
| (verb) perceive intuitively or through some inexplicable perceptive powers | - |
| 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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| done | (adjective) cooked until ready to serve | - |
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| (adjective) having finished or arrived at completion | Synonyms: through, through with |
| 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 |
| (verb) talk in a monotonous voice | Synonyms: drone on |
| (verb) make a monotonous low dull sound | - |
| 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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| eccrine | (adjective) (of exocrine glands) producing a clear aqueous secretion without releasing part of the secreting cell; important in regulating body temperature | - |
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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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| elephantine | (adjective) of great mass; huge and bulky | Synonyms: gargantuan, giant, jumbo |
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| emplane | (verb) board a plane | Synonyms: enplane |
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| enamine | (noun) an amine containing the double bond linkage -C=C-N- | - |
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| endocrine | (adjective) of or belonging to endocrine glands or their secretions | Synonyms: endocrinal |
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| (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 |
| (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 | - |
| enplane | (verb) board a plane | Synonyms: emplane |
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| enshrine | (verb) enclose in a shrine | Synonyms: shrine |
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| (verb) hold sacred | Synonyms: saint |
| enthrone | (verb) put a monarch on the throne | Synonyms: throne |
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| (verb) provide with power and authority | Synonyms: invest, vest |
| 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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| entwine | (verb) spin, wind, or twist together | Synonyms: enlace, interlace, intertwine, lace, twine |
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| (verb) tie or link together | Synonyms: knit |
| 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 | (adjective) having an ambiguous sexual identity | Synonyms: bisexual |
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| (adjective) having unsuitable feminine qualities | Synonyms: cissy, effeminate, emasculate, sissified, sissy, sissyish |
| (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 |
| 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 | (adjective) resembling a horse | - |
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| (adjective) of or belonging to the family Equidae | - |
| (noun) hoofed mammals having slender legs and a flat coat with a narrow mane along the back of the neck | Synonyms: equid |
| 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 | - |
| erne | (noun) bulky greyish-brown eagle with a short wedge-shaped white tail; of Europe and Greenland | Synonyms: ern, European sea eagle, gray sea eagle, grey sea eagle, Haliatus albicilla, white-tailed sea eagle |
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| errhine | (adjective) causing nasal discharge | - |
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| estrone | (noun) a naturally occurring weak estrogenic hormone secreted by the mammalian ovary; synthesized (trade name Estronol) and used to treat estrogen deficiency | Synonyms: Estronol, oestrone, theelin |
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| estuarine | (adjective) of or relating to or found in estuaries | Synonyms: estuarial |
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| etamine | (noun) a soft cotton or worsted fabric with an open mesh; used for curtains or clothing etc. | Synonyms: etamin |
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| ethane | (noun) a colorless odorless alkane gas used as fuel | Synonyms: C2H6 |
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| ethene | (noun) a flammable colorless gaseous alkene; obtained from petroleum and natural gas and used in manufacturing many other chemicals; sometimes used as an anesthetic | Synonyms: ethylene |
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| ethoxyethane | (noun) a colorless volatile highly flammable liquid formerly used as an inhalation anesthetic | Synonyms: diethyl ether, divinyl ether, ether, ethyl ether, vinyl ether |
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| ethylene | (noun) a flammable colorless gaseous alkene; obtained from petroleum and natural gas and used in manufacturing many other chemicals; sometimes used as an anesthetic | Synonyms: ethene |
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| ethyne | (noun) a colorless flammable gas used chiefly in welding and in organic synthesis | Synonyms: acetylene, alkyne |
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| examine | (verb) consider in detail and subject to an analysis in order to discover essential features or meaning | Synonyms: analyse, analyze, canvass, study |
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| (verb) question closely | - |
| (verb) question or examine thoroughly and closely | Synonyms: probe |
| (verb) observe, check out, and look over carefully or inspect | Synonyms: see |
| (verb) put to the test, as for its quality, or give experimental use to | Synonyms: essay, prove, test, try, try out |
| exocrine | (adjective) of or relating to exocrine glands or their secretions | - |
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| (noun) a gland that secretes externally through a duct | Synonyms: duct gland, exocrine gland |
| exsanguine | (adjective) destitute of blood or apparently so | Synonyms: bloodless, exsanguinous |
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| falconine | (adjective) relating to or resembling a falcon | - |
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| famine | (noun) a severe shortage of food (as through crop failure) resulting in violent hunger and starvation and death | - |
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| (noun) an acute insufficiency | Synonyms: dearth, shortage |
| famotidine | (noun) a histamine blocker (trade name Pepcid) used to treat peptic ulcers and gastritis and esophageal reflux | Synonyms: Pepcid |
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| fedelline | (noun) extremely fine pasta thinner than vermicelli | - |
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| feline | (adjective) of or relating to cats | - |
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| (noun) any of various lithe-bodied roundheaded fissiped mammals, many with retractile claws | Synonyms: felid |
| feminine | (adjective) associated with women and not with men | - |
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| (adjective) female (of grammatical gender) | - |
| (adjective) befitting or characteristic of a woman especially a mature woman | Synonyms: womanly |
| (adjective) (music or poetry) ending on an unaccented beat or syllable | - |
| (noun) a gender that refers chiefly (but not exclusively) to females or to objects classified as female | - |
| ferine | (adjective) wild and menacing | Synonyms: feral, savage |
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| fettuccine | (noun) pasta in flat strips wider than linguine | Synonyms: fettuccini |
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| fieldstone | (noun) stone that occurs naturally in fields; often used as building material | - |
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| figurine | (noun) a small carved or molded figure | Synonyms: statuette |
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| fine | (adjective) of textures that are smooth to the touch or substances consisting of relatively small particles | - |
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| (adjective) characterized by elegance or refinement or accomplishment | - |
| (adjective) minutely precise especially in differences in meaning | - |
| (adjective) free from impurities; having a high or specified degree of purity | - |
| (adjective) being satisfactory or in satisfactory condition | Synonyms: all right, cool, hunky-dory, o.k., ok, okay |
| (adjective) thin in thickness or diameter | - |
| (noun) money extracted as a penalty | Synonyms: amercement, mulct |
| (adverb) an expression of agreement normally occurring at the beginning of a sentence | Synonyms: all right, alright, OK, very well |
| (adverb) in a delicate manner | Synonyms: delicately, exquisitely, finely |
| (verb) impose a fine on | Synonyms: mulct |
| (verb) record a fine as a penalty in a police record | Synonyms: ticket |
| firestone | (noun) a sandstone that withstands intense heat; used to line fireplaces and furnaces and kilns | - |
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| (noun) a piece of flint that is struck to light a fire | - |
| fishbone | (noun) a bone of a fish | - |
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| flagstone | (noun) stratified stone that splits into pieces suitable as paving stones | Synonyms: flag |
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| flavone | (noun) a colorless crystalline compound that is part of a number of white or yellow plant pigments | - |
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| fleabane | (noun) hairy perennial Eurasian herb with yellow daisylike flowers reputed to destroy or drive away fleas | Synonyms: feabane mullet, Pulicaria dysenterica |
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| (noun) any of several North American plants of the genus Erigeron having daisylike flowers; formerly believed to repel fleas | - |
| (noun) common North American weed with linear leaves and small discoid heads of yellowish flowers; widely naturalized throughout temperate regions; sometimes placed in genus Erigeron | Synonyms: Canadian fleabane, Conyza canadensis, Erigeron canadensis, horseweed |
| flintstone | (noun) pebbles of flint used in masonry construction | - |
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| floatplane | (noun) a seaplane equipped with pontoons for landing or taking off from water | Synonyms: pontoon plane |
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| floxuridine | (noun) antineoplastic drug used to treat some cancers; can cause loss of hair | - |
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| fluoresceine | (noun) a yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed) | Synonyms: fluorescein, fluorescent dye, resorcinolphthalein |
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| fluorine | (noun) a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite | Synonyms: atomic number 9, F |
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| fluoxetine | (noun) a selective-serotonin reuptake inhibitor commonly prescribed as an antidepressant (trade names Prozac or Sarafem); it is thought to work by increasing the activity of serotonin in the brain | Synonyms: fluoxetine hydrocholoride, Prozac, Sarafem |
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| fluphenazine | (noun) tranquilizer used to treat psychotic disorders | - |
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| foregone | (adjective) well in the past; former | Synonyms: bygone, bypast, departed, gone |
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| fortune | (noun) an unknown and unpredictable phenomenon that causes an event to result one way rather than another | Synonyms: chance, hazard, luck |
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| (noun) an unknown and unpredictable phenomenon that leads to a favorable outcome | Synonyms: luck |
| (noun) a large amount of wealth or prosperity | - |
| (noun) your overall circumstances or condition in life (including everything that happens to you) | Synonyms: circumstances, destiny, fate, lot, luck, portion |