| diam | (noun) the length of a straight line passing through the center of a circle and connecting two points on the circumference | Synonyms: diameter |
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| diamagnetism | (noun) phenomenon exhibited by materials like copper or bismuth that become magnetized in a magnetic field with a polarity opposite to the magnetic force; unlike iron they are slightly repelled by a magnet | - |
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| diaphragm | (noun) a mechanical device in a camera that controls size of aperture of the lens | Synonyms: stop |
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| (noun) electro-acoustic transducer that vibrates to receive or produce sound waves | - |
| (noun) a contraceptive device consisting of a flexible dome-shaped cup made of rubber or plastic; it is filled with spermicide and fitted over the uterine cervix | Synonyms: contraceptive diaphragm, pessary |
| (noun) (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration | Synonyms: midriff |
| diastrophism | (noun) the process of deformation that produces continents and ocean basins in the earth's crust | - |
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| diatom | (noun) microscopic unicellular marine or freshwater colonial alga having cell walls impregnated with silica | - |
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| diazepam | (noun) a tranquilizer (trade name Valium) used to relieve anxiety and relax muscles; acts by enhancing the inhibitory actions of the neurotransmitter GABA; can also be used as an anticonvulsant drug in cases of nerve agent poisoning | Synonyms: Valium |
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| diazonium | (noun) the univalent cation R-N:N- (where R is an aromatic hydrocarbon); found in salts that are used in manufacturing azo dyes | - |
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| dichroism | (noun) pleochroism of a crystal so that it exhibits two different colors when viewed from two different directions | - |
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| dichromatism | (noun) a deficiency of color vision in which the person can match any given hue by mixing only two other wavelengths of light (as opposed to the three wavelengths needed by people with normal color vision) | Synonyms: dichromacy, dichromasy, dichromatopsia, dichromia |
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| dictostylium | (noun) any slime mold of the genus Dictostylium | - |
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| dictum | (noun) an authoritative declaration | Synonyms: pronouncement, say-so |
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| (noun) an opinion voiced by a judge on a point of law not directly bearing on the case in question and therefore not binding | Synonyms: obiter dictum |
| didacticism | (noun) communication that is suitable for or intended to be instructive | - |
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| diestrum | (noun) (of animals having several estrous cycles in one breeding season) a state or interval of sexual inactivity or quiescence between periods of activity | Synonyms: diestrus |
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| digram | (noun) two successive letters (especially two letters used to represent a single sound: `sh' in `shoe') | Synonyms: digraph |
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| diltiazem | (noun) a calcium blocker (trade name Cardizem) used in treating hypertension or angina or heart failure | Synonyms: Cardizem |
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| dim | (adjective) made dim or less bright | Synonyms: dimmed |
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| (adjective) lacking in light; not bright or harsh | Synonyms: subdued |
| (adjective) offering little or no hope | Synonyms: black, bleak |
| (adjective) lacking clarity or distinctness | Synonyms: faint, shadowy, vague, wispy |
| (adjective) slow to learn or understand; lacking intellectual acuity | Synonyms: dense, dull, dumb, obtuse, slow |
| (verb) make dim or lusterless | - |
| (verb) become dim or lusterless | - |
| (verb) make dim by comparison or conceal | Synonyms: blind |
| (verb) become vague or indistinct | Synonyms: blur, slur |
| (verb) switch (a car's headlights) from a higher to a lower beam | Synonyms: dip |
| dimorphism | (noun) (biology) the existence of two forms of individual within the same animal species (independent of sex differences) | - |
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| (noun) (chemistry) the property of certain substances that enables them to exist in two distinct crystalline forms | - |
| dirham | (noun) worth one tenth of a Kuwaiti dinar; equal 100 fils | Synonyms: Kuwaiti dirham |
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| (noun) 100 dirhams equal 1 dinar in Libya | Synonyms: Libyan dirham |
| (noun) 100 dirhams equal 1 dinar in Tunisia | Synonyms: Tunisian dirham |
| (noun) the basic unit of money in Morocco; equal to 100 centimes | Synonyms: Moroccan dirham |
| (noun) the basic unit of money in the United Arab Emirates; equal to 100 fils | Synonyms: United Arab Emirate dirham |
| (noun) 100 dirhams equal 1 riyal in Qatar | Synonyms: Qatari dirham |
| disarm | (verb) remove offensive capability from | Synonyms: demilitarise, demilitarize |
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| (verb) take away the weapons from; render harmless | Synonyms: unarm |
| (verb) make less hostile; win over | - |
| disciform | (adjective) having a round or oval shape like a disc | - |
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| disclaim | (verb) make a disclaimer about | - |
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| (verb) renounce a legal claim or title to | - |
| disequilibrium | (noun) loss of equilibrium attributable to an unstable situation in which some forces outweigh others | - |
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| disesteem | (noun) the state in which esteem has been lost | - |
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| (verb) have little or no respect for; hold in contempt | Synonyms: disrespect |
| disulfiram | (noun) a drug (trade name Antabuse) used in the treatment of alcoholism; causes nausea and vomiting if alcohol is ingested | Synonyms: Antabuse |
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| diverticulum | (noun) a herniation through the muscular wall of a tubular organ (especially the colon) | - |
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| dkm | (noun) a metric unit of length equal to ten meters | Synonyms: dam, decameter, decametre, dekameter, dekametre |
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| dm | (noun) a metric unit of length equal to one tenth of a meter | Synonyms: decimeter, decimetre |
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| dogmatism | (noun) tendency to assert principles as undeniably true | - |
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| dolabriform | (adjective) having the shape of the head of an ax or cleaver | Synonyms: dolabrate |
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| dolichocephalism | (noun) the quality of being dolichocephalic | Synonyms: dolichocephaly |
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| doliolum | (noun) free-swimming oceanic tunicate with a barrel-shaped transparent body | - |
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| domatium | (noun) a part of a plant (e.g., a leaf) that has been modified to provide protection for insects or mites or fungi | - |
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| doom | (noun) an unpleasant or disastrous destiny | Synonyms: day of reckoning, doomsday, end of the world |
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| (verb) pronounce a sentence on (somebody) in a court of law | Synonyms: condemn, sentence |
| (verb) decree or designate beforehand | Synonyms: designate, destine, fate |
| (verb) make certain of the failure or destruction of | - |
| dorm | (noun) a college or university building containing living quarters for students | Synonyms: dormitory, hall, residence hall, student residence |
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| dorsum | (noun) the back of the body of a vertebrate or any analogous surface (as the upper or outer surface of an organ or appendage or part) | - |
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| (noun) the posterior part of a human (or animal) body from the neck to the end of the spine | Synonyms: back |
| downstream | (adjective) in the direction of a stream's current | - |
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| (adverb) away from the source or with the current | Synonyms: downriver |
| drachm | (noun) a unit of apothecary weight equal to an eighth of an ounce or to 60 grains | Synonyms: drachma, dram |
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| (noun) a unit of capacity or volume in the apothecary system equal to one eighth of a fluid ounce | Synonyms: fluid drachm, fluid dram, fluidram |
| (noun) a British imperial capacity measure (liquid or dry) equal to 60 minims or 3.5516 cubic centimeters | Synonyms: fluid drachm, fluid dram, fluidram |
| dracontium | (noun) any plant of the genus Dracontium; strongly malodorous tropical American plants usually with gigantic leaves | - |
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| dram | (noun) the basic unit of money in Armenia | - |
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| (noun) 1/16 ounce or 1.771 grams | - |
| (noun) a unit of apothecary weight equal to an eighth of an ounce or to 60 grains | Synonyms: drachm, drachma |
| dream | (noun) a series of mental images and emotions occurring during sleep | Synonyms: dreaming |
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| (noun) imaginative thoughts indulged in while awake | Synonyms: dreaming |
| (noun) a fantastic but vain hope (from fantasies induced by the opium pipe) | Synonyms: pipe dream |
| (noun) a state of mind characterized by abstraction and release from reality | - |
| (noun) a cherished desire | Synonyms: ambition, aspiration |
| (noun) someone or something wonderful | - |
| (verb) have a daydream; indulge in a fantasy | Synonyms: daydream, stargaze, woolgather |
| (verb) experience while sleeping | - |
| druidism | (noun) the system of religion and philosophy taught by the Druids and their rites and ceremonies | - |
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| drum | (noun) small to medium-sized bottom-dwelling food and game fishes of shallow coastal and fresh waters that make a drumming noise | Synonyms: drumfish |
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| (noun) a musical percussion instrument; usually consists of a hollow cylinder with a membrane stretched across each end | Synonyms: membranophone, tympan |
| (noun) a cylindrical metal container, commonly used for shipping or storage of liquids | Synonyms: metal drum |
| (noun) a hollow cast iron cylinder attached to the wheel that forms part of the brakes | Synonyms: brake drum |
| (noun) the sound of a drum | - |
| (noun) a bulging cylindrical shape; hollow with flat ends | Synonyms: barrel |
| (verb) study intensively, as before an exam | Synonyms: bone, bone up, cram, get up, grind away, mug up, swot, swot up |
| (verb) play a percussion instrument | - |
| (verb) make a rhythmic sound | Synonyms: beat, thrum |
| dualism | (noun) the doctrine that reality consists of two basic opposing elements, often taken to be mind and matter (or mind and body), or good and evil | - |
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| dubnium | (noun) a transuranic element with atomic number 105 | Synonyms: atomic number 105, Db, element 105, hahnium |
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| dukedom | (noun) the domain controlled by a duke or duchess | Synonyms: duchy |
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| (noun) the dignity or rank or position of a duke | - |
| dumdum | (noun) a soft-nosed small-arms bullet that expands when it hits a target and causes a gaping wound | Synonyms: dumdum bullet |
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| duodenum | (noun) the part of the small intestine between the stomach and the jejunum | - |
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| durum | (noun) wheat with hard dark-colored kernels high in gluten and used for bread and pasta; grown especially in southern Russia, North Africa, and northern central North America | Synonyms: durum wheat, hard wheat, macaroni wheat, Triticum durum, Triticum turgidum |
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| dwarfism | (noun) a genetic abnormality resulting in short stature | Synonyms: nanism |
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| dynamism | (noun) the activeness of an energetic personality | Synonyms: oomph, pizzaz, pizzazz, zing |
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| (noun) active strength of body or mind | Synonyms: heartiness, vigor, vigour |
| (noun) any of the various theories or doctrines or philosophical systems that attempt to explain the phenomena of the universe in terms of some immanent force or energy | - |
| dysphemism | (noun) an offensive or disparaging expression that is substituted for an inoffensive one | - |
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| dysprosium | (noun) a trivalent metallic element of the rare earth group; forms compounds that are highly magnetic | Synonyms: atomic number 66, Dy |
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| eardrum | (noun) the membrane in the ear that vibrates to sound | Synonyms: myringa, tympanic membrane, tympanum |
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| earldom | (noun) the domain controlled by an earl or count or countess | - |
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| (noun) the dignity or rank or position of an earl or countess | - |
| earthworm | (noun) terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers | Synonyms: angleworm, crawler, dew worm, fishing worm, fishworm, nightcrawler, nightwalker, red worm, wiggler |
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| ecclesiasticism | (noun) excessive adherence to ecclesiastical forms and activities | - |
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| (noun) religion appropriate to a church and to ecclesiastical principles and practices | - |
| echinoderm | (noun) marine invertebrates with tube feet and five-part radially symmetrical bodies | - |
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| echocardiogram | (noun) a graphical image of the heart produced by an echocardiograph | - |
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| echoencephalogram | (noun) a graphical image of the brain produced by an echoencephalograph | - |
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| echogram | (noun) an image of a structure that is produced by ultrasonography (reflections of high-frequency sound waves); used to observe fetal growth or to study bodily organs | Synonyms: sonogram |
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| eclecticism | (noun) making decisions on the basis of what seems best instead of following some single doctrine or style | Synonyms: eclectic method |
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| ecosystem | (noun) a system formed by the interaction of a community of organisms with their physical environment | - |
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| ecoterrorism | (noun) violence carried out to further the political or social objectives of the environmentalists | Synonyms: eco-warfare, ecological terrorism, ecological warfare |
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| ecotourism | (noun) tourism to exotic or threatened ecosystems to observe wildlife or to help preserve nature | - |
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| ectoderm | (noun) the outer germ layer that develops into skin and nervous tissue | Synonyms: ectoblast, exoderm |
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| ectoplasm | (noun) the outer granule-free layer of cytoplasm | - |
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| (noun) (spiritualism) a substance supposed to emanate from the body of the medium during a trance | - |
| ectotherm | (noun) an animal whose body temperature varies with the temperature of its surroundings; any animal except birds and mammals | Synonyms: poikilotherm |
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| ecumenicalism | (noun) (Christianity) the doctrine of the ecumenical movement that promotes cooperation and better understanding among different religious denominations: aimed at universal Christian unity | Synonyms: ecumenicism, ecumenism |
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| ecumenicism | (noun) (Christianity) the doctrine of the ecumenical movement that promotes cooperation and better understanding among different religious denominations: aimed at universal Christian unity | Synonyms: ecumenicalism, ecumenism |
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| ecumenism | (noun) (Christianity) the doctrine of the ecumenical movement that promotes cooperation and better understanding among different religious denominations: aimed at universal Christian unity | Synonyms: ecumenicalism, ecumenicism |
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| (noun) a movement promoting union between religions (especially between Christian churches) | Synonyms: oecumenism |
| eelworm | (noun) any of various small free-living plant-parasitic roundworms | - |
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| effluvium | (noun) a foul-smelling outflow or vapor (especially a gaseous waste) | - |
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| egalitarianism | (noun) the doctrine of the equality of mankind and the desirability of political and economic and social equality | Synonyms: equalitarianism |
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| egocentrism | (noun) concern for your own interests and welfare | Synonyms: egoism, self-centeredness, self-concern, self-interest |
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| egoism | (noun) concern for your own interests and welfare | Synonyms: egocentrism, self-centeredness, self-concern, self-interest |
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| (noun) (ethics) the theory that the pursuit of your own welfare is the basis of morality | - |
| egotism | (noun) an exaggerated opinion of your own importance | Synonyms: self-importance, swelled head |
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| (noun) an inflated feeling of pride in your superiority to others | Synonyms: ego, self-importance |
| einsteinium | (noun) a radioactive transuranic element produced by bombarding plutonium with neutrons | Synonyms: atomic number 99, E, Es |
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| electrocardiogram | (noun) a graphical recording of the cardiac cycle produced by an electrocardiograph | Synonyms: cardiogram, ECG, EKG |
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| electroencephalogram | (noun) a graphical record of electrical activity of the brain; produced by an electroencephalograph | Synonyms: EEG, encephalogram |
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| electromagnetism | (noun) the branch of physics concerned with electromagnetic phenomena | Synonyms: electromagnetics |
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| (noun) magnetism produced by an electric current | - |
| electromyogram | (noun) a graphical record of electric currents associated with muscle contractions | Synonyms: EMG |
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| electroretinogram | (noun) a graphical recording of the electrical activity of the retina that results when light is flashed into the eye | - |
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| electrum | (noun) an alloy of gold and silver | - |
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| elitism | (noun) the attitude that society should be governed by an elite group of individuals | - |
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| elm | (noun) any of various trees of the genus Ulmus: important timber or shade trees | Synonyms: elm tree |
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| (noun) hard tough wood of an elm tree; used for e.g. implements and furniture | Synonyms: elmwood |
| em | (noun) a quad with a square body | Synonyms: em quad, mutton quad |
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| (noun) a linear unit (1/6 inch) used in printing | Synonyms: pica, pica em |
| embalm | (verb) preserve a dead body | - |
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| emblem | (noun) special design or visual object representing a quality, type, group, etc. | - |
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| (noun) a visible symbol representing an abstract idea | Synonyms: allegory |
| embolism | (noun) occlusion of a blood vessel by an embolus (a loose clot or air bubble or other particle) | - |
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| (noun) an insertion into a calendar | Synonyms: intercalation |
| emotionalism | (noun) emotional nature or quality | Synonyms: emotionality |
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| empiricism | (noun) the application of empirical methods in any art or science | - |
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| (noun) medical practice and advice based on observation and experience in ignorance of scientific findings | Synonyms: quackery |
| (noun) (philosophy) the doctrine that knowledge derives from experience | Synonyms: empiricist philosophy, sensationalism |
| emporium | (noun) a large retail store organized into departments offering a variety of merchandise; commonly part of a retail chain | Synonyms: department store |
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| emunctorium | (noun) a white linen cloth which is used to wipe the chalice after each communicant partakes. | Synonyms: purificator, purificatorium |
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| enanthem | (noun) eruption on a mucous membrane (as the inside of the mouth) occurring as a symptom of a disease | Synonyms: enanthema |
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| enantiomorphism | (noun) the relation of opposition between crystals or molecules that are reflections of one another | Synonyms: mirror-image relation |
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| encephalogram | (noun) an X ray of the brain made by replacing spinal fluid with a gas (usually oxygen) to improve contrast | Synonyms: pneumoencephalogram |
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| (noun) a graphical record of electrical activity of the brain; produced by an electroencephalograph | Synonyms: EEG, electroencephalogram |
| encomium | (noun) a formal expression of praise | Synonyms: eulogy, paean, panegyric, pean |
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| encyclopaedism | (noun) profound scholarly knowledge | Synonyms: encyclopedism, eruditeness, erudition, learnedness, learning, scholarship |
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| encyclopedism | (noun) profound scholarly knowledge | Synonyms: encyclopaedism, eruditeness, erudition, learnedness, learning, scholarship |
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| endaemonism | (noun) an ethical system that evaluates actions by reference to personal well-being through a life based on reason | Synonyms: eudemonism |
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