| dictostylium | (noun) any slime mold of the genus Dictostylium | - |
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| dictyosome | (noun) a netlike structure in the cytoplasm of animal cells (especially in those cells that produce secretions) | Synonyms: Golgi apparatus, Golgi body, Golgi complex |
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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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| dihydrostreptomycin | (noun) antibiotic consisting of a hydrogenated form of streptomycin; used against tuberculosis and tularemia and Gram-negative organisms | - |
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| dinosaur | (noun) any of numerous extinct terrestrial reptiles of the Mesozoic era | - |
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| disclosure | (noun) the speech act of making something evident | Synonyms: revealing, revelation |
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| discomposure | (noun) a temperament that is perturbed and lacking in composure | - |
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| (noun) anxious embarrassment | Synonyms: discomfiture, disconcertion, disconcertment |
| disposable | (noun) an item that can be disposed of after it has been used | - |
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| disposal | (noun) the act or means of getting rid of something | Synonyms: disposition |
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| (noun) a method of tending to or managing the affairs of some group of people (especially the group's business affairs) | Synonyms: administration |
| (noun) a kitchen appliance for disposing of garbage | Synonyms: electric pig, garbage disposal |
| (noun) the power to use something or someone | - |
| disposition | (noun) the act or means of getting rid of something | Synonyms: disposal |
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| (noun) your usual mood | Synonyms: temperament |
| (noun) a natural or acquired habit or characteristic tendency in a person or thing | - |
| (noun) an attitude of mind especially one that favors one alternative over others | Synonyms: inclination, tendency |
| dispossession | (noun) the expulsion of someone (such as a tenant) from the possession of land by process of law | Synonyms: eviction, legal ouster |
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| (noun) freeing from evil spirits | Synonyms: exorcism |
| distomatosis | (noun) a disease of the liver (especially in sheep and cattle) caused by liver flukes and their by-products | Synonyms: black disease, liver rot, sheep rot |
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| ditchmoss | (noun) submerged freshwater perennials | Synonyms: Elodea, genus Elodea, pondweed |
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| diverticulosis | (noun) presence of multiple diverticula in the walls of the colon | - |
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| dominos | (noun) any of several games played with small rectangular blocks | Synonyms: dominoes |
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| doorpost | (noun) a jamb for a door | Synonyms: doorjamb |
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| dosage | (noun) a measured portion of medicine taken at any one time | Synonyms: dose |
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| (noun) the quantity of an active agent (substance or radiation) taken in or absorbed at any one time | Synonyms: dose |
| dose | (noun) a measured portion of medicine taken at any one time | Synonyms: dosage |
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| (noun) street name for lysergic acid diethylamide | Synonyms: acid, back breaker, battery-acid, dot, Elvis, loony toons, Lucy in the sky with diamonds, pane, superman, window pane, Zen |
| (noun) the quantity of an active agent (substance or radiation) taken in or absorbed at any one time | Synonyms: dosage |
| (noun) a communicable infection transmitted by sexual intercourse or genital contact | Synonyms: Cupid's disease, Cupid's itch, sexually transmitted disease, social disease, STD, VD, venereal disease, venereal infection, Venus's curse |
| dosemeter | (noun) a measuring instrument for measuring doses of ionizing radiation (X-rays or radioactivity) | Synonyms: dosimeter |
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| dosimeter | (noun) a measuring instrument for measuring doses of ionizing radiation (X-rays or radioactivity) | Synonyms: dosemeter |
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| dosimetry | (noun) measuring the dose of radiation emitted by a radioactive source | - |
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| dossal | (noun) an ornamental hanging of rich fabric hung behind the altar of a church or at the sides of a chancel | Synonyms: dossel |
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| dossel | (noun) an ornamental hanging of rich fabric hung behind the altar of a church or at the sides of a chancel | Synonyms: dossal |
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| dosser | (noun) someone who sleeps in any convenient place | Synonyms: street person |
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| dosshouse | (noun) a cheap lodging house | Synonyms: flophouse |
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| dossier | (noun) a collection of papers containing detailed information about a particular person or subject (usually a person's record) | - |
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| doxazosin | (noun) an antihypertensive drug (trade name Cardura) that works by relaxing blood vessels so that blood passes through them more easily; it is also used to treat benign prostatic hyperplasia | Synonyms: Cardura |
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| dromaeosaur | (noun) a kind of maniraptor | - |
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| droshky | (noun) an open horse-drawn carriage with four wheels; formerly used in Poland and Russia | Synonyms: drosky |
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| drosky | (noun) an open horse-drawn carriage with four wheels; formerly used in Poland and Russia | Synonyms: droshky |
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| drosophila | (noun) small fruit fly used by Thomas Hunt Morgan in studying basic mechanisms of inheritance | Synonyms: Drosophila melanogaster |
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| dross | (noun) the scum formed by oxidation at the surface of molten metals | Synonyms: scoria, slag |
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| (noun) worthless or dangerous material that should be removed | Synonyms: impurity |
| dysosmia | (noun) a disorder in the sense of smell | Synonyms: olfactory impairment, parosamia |
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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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| ecchymosis | (noun) the escape of blood from ruptured blood vessels into the surrounding tissue to form a purple or black-and-blue spot on the skin | - |
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| (noun) the purple or black-and-blue area resulting from a bruise | - |
| echinococcosis | (noun) infestation with larval echinococci (tapeworms) | Synonyms: hydatid disease, hydatidosis |
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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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| edaphosaurus | (noun) heavy-bodied reptile with a dorsal sail or crest; of the late Paleozoic | - |
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| edmontosaurus | (noun) duck-billed dinosaur from Canada found as a fossilized mummy with skin | - |
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| eidos | (noun) (anthropology) the distinctive expression of the cognitive or intellectual character of a culture or a social group | - |
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| elastosis | (noun) breakdown of elastic tissue (as the loss of elasticity in the skin of elderly people that results from degeneration of connective tissue) | - |
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| electrodeposition | (noun) the deposition of a substance on an electrode by the action of electricity (especially by electrolysis) | - |
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| electroscope | (noun) measuring instrument that detects electric charge; two gold leaves diverge owing to repulsion of charges with like sign | - |
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| electroshock | (noun) the administration of a strong electric current that passes through the brain to induce convulsions and coma | Synonyms: ECT, electroconvulsive therapy, electroshock therapy |
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| electrosleep | (noun) unconsciousness brought about by the passage of a low voltage electric current through the brain | - |
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| electrostatics | (noun) the branch of physics that deals with static electricity | - |
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| electrosurgery | (noun) surgery performed with electrical devices (as in electrocautery) | - |
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| embossment | (noun) sculpture consisting of shapes carved on a surface so as to stand out from the surrounding background | Synonyms: relief, relievo, rilievo, sculptural relief |
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| (noun) an impression produced by pressure or printing | Synonyms: imprint |
| enarthrosis | (noun) a freely moving joint in which a sphere on the head of one bone fits into a rounded cavity in the other bone | Synonyms: articulatio spheroidea, ball-and-socket joint, cotyloid joint, enarthrodial joint, spheroid joint |
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| encephalartos | (noun) any of numerous cycads of the genus Encephalartos having stout cylindrical trunks and a terminal crown of long often spiny pinnate leaves | - |
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| enclosing | (noun) the act of enclosing something inside something else | Synonyms: enclosure, envelopment, inclosure |
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| enclosure | (noun) the act of enclosing something inside something else | Synonyms: enclosing, envelopment, inclosure |
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| (noun) a structure consisting of an area that has been enclosed for some purpose | - |
| (noun) something (usually a supporting document) that is enclosed in an envelope with a covering letter | Synonyms: inclosure |
| (noun) a naturally enclosed space | Synonyms: natural enclosure |
| endometriosis | (noun) the presence of endometrium elsewhere than in the lining of the uterus; causes premenstrual pain and dysmenorrhea | Synonyms: adenomyosis |
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| endoscope | (noun) a long slender medical instrument for examining the interior of a bodily organ or performing minor surgery | - |
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| endoscopy | (noun) visual examination of the interior of a hollow body organ by use of an endoscope | - |
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| endoskeleton | (noun) the internal skeleton; bony and cartilaginous structure (especially of vertebrates) | - |
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| endosperm | (noun) nutritive tissue surrounding the embryo within seeds of flowering plants | - |
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| endospore | (noun) a small asexual spore that develops inside the cell of some bacteria and algae | - |
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| endosteum | (noun) vascular membrane that lines the inner surface of long bones | - |
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| engrossment | (noun) the quality of being intent and concentrated | Synonyms: intentness |
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| (noun) the mental state of being preoccupied by something | Synonyms: absorption, preoccupancy, preoccupation |
| (noun) complete attention; intense mental effort | Synonyms: absorption, concentration, immersion |
| enosis | (noun) the union of Greece and Cyprus (which is the goal of a group of Greek Cypriots) | - |
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| enteroptosis | (noun) an abnormally downward position of the intestines in the abdominal cavity | - |
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| enteroscope | (noun) an instrument for inspecting the inside of the intestine. | - |
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| enterostenosis | (noun) abnormal narrowing of the intestine | - |
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| enterostomy | (noun) surgical operation that creates a permanent opening through the abdominal wall into the intestine | Synonyms: enterotomy |
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| eosin | (noun) a red fluorescent dye resulting from the action of bromine on fluorescein; used in cosmetics and as a biological stain for studying cell structures | Synonyms: bromeosin |
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| eosinopenia | (noun) a decrease in the number of eosinophils in the blood | - |
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| eosinophil | (noun) a leukocyte readily stained with eosin | Synonyms: eosinophile |
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| eosinophile | (noun) a leukocyte readily stained with eosin | Synonyms: eosinophil |
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| eosinophilia | (noun) a symptom of allergic states; increased eosinophils in the blood | - |
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| epanodos | (noun) repetition of a group of words in reverse order | - |
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| (noun) recapitulation of the main ideas of a speech (especially in reverse order) | - |
| epanorthosis | (noun) immediate rephrasing for intensification or justification | - |
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| epos | (noun) a long narrative poem telling of a hero's deeds | Synonyms: epic, epic poem, heroic poem |
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| (noun) a body of poetry that conveys the traditions of a society by treating some epic theme | - |
| ergosterol | (noun) a plant sterol that is converted into vitamin D by ultraviolet radiation | - |
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| eros | (noun) a desire for sexual intimacy | Synonyms: concupiscence, physical attraction, sexual desire |
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| erosion | (noun) (geology) the mechanical process of wearing or grinding something down (as by particles washing over it), also figuratively | Synonyms: eating away, eroding, wearing, wearing away |
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| (noun) erosion by chemical action | Synonyms: corroding, corrosion |
| (noun) a gradual decline of something | - |
| (noun) condition in which the earth's surface is worn away by the action of water and wind | - |
| erosiveness | (noun) The state or quality of causing or tending to wear away or erode. | - |
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| erythroblastosis | (noun) a blood disease characterized by the abnormal presence of erythroblasts in the blood | - |
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| esophagoscope | (noun) an optical instrument for examining the inside of the esophagus | Synonyms: oesophagoscope |
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| ethnos | (noun) people of the same race or nationality who share a distinctive culture | Synonyms: ethnic group |
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| ethos | (noun) (anthropology) the distinctive spirit of a culture or an era | - |
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| ethosuximide | (noun) an anticonvulsant drug (trade names Emeside and Zarontin) used to treat petit mal epilepsy | Synonyms: Emeside, Zarontin |
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| exomphalos | (noun) an umbilical hernia at birth in which some abdominal organs push into the umbilical cord | - |
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| exophthalmos | (noun) protrusion of the eyeball from the socket | - |
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| exoskeleton | (noun) the exterior protective or supporting structure or shell of many animals (especially invertebrates) including bony or horny parts such as nails or scales or hoofs | - |
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| exosphere | (noun) the outermost atmospheric layer | - |
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| exostosis | (noun) a benign outgrowth from a bone (usually covered with cartilage) | - |
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| explosion | (noun) the act of exploding or bursting | Synonyms: burst |
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| (noun) a golf shot from a bunker that typically moves sand as well as the golf ball | - |
| (noun) the terminal forced release of pressure built up during the occlusive phase of a stop consonant | Synonyms: plosion |
| (noun) a sudden outburst | - |
| (noun) a violent release of energy caused by a chemical or nuclear reaction | Synonyms: blowup, detonation |
| (noun) a sudden great increase | - |
| (noun) the noise caused by an explosion | - |
| explosive | (noun) a chemical substance that undergoes a rapid chemical change (with the production of gas) on being heated or struck | - |
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| expose | (noun) the exposure of an impostor or a fraud | Synonyms: unmasking |
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| exposition | (noun) a systematic interpretation or explanation (usually written) of a specific topic | Synonyms: expounding |
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| (noun) an account that sets forth the meaning or intent of a writing or discourse | - |
| (noun) (music) the section of a movement (especially in sonata form) where the major musical themes first occur | - |
| (noun) a collection of things (goods or works of art etc.) for public display | Synonyms: exhibition, expo |
| expositor | (noun) a person who explains | Synonyms: expounder |
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| expostulation | (noun) the act of expressing earnest opposition or protest | Synonyms: objection, remonstrance, remonstration |
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| (noun) an exclamation of protest or remonstrance or reproof | - |
| exposure | (noun) abandoning without shelter or protection (as by leaving an infant out in the open) | - |
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| (noun) the act of exposing film to light | - |
| (noun) presentation to view in an open or public manner | - |
| (noun) the act of subjecting someone to an influencing experience | - |
| (noun) a representation of a person or scene in the form of a print or transparent slide or in digital format | Synonyms: photo, photograph, pic, picture |
| (noun) vulnerability to the elements; to the action of heat or cold or wind or rain | - |
| (noun) aspect resulting from the direction a building or window faces | - |
| (noun) the disclosure of something secret | - |
| (noun) the intensity of light falling on a photographic film or plate | - |
| (noun) the state of being vulnerable or exposed | Synonyms: vulnerability |
| extrados | (noun) the exterior curve of an arch | - |
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| extrospection | (noun) examination or observation of what is outside oneself, as opposed to introspection. | - |
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| fasciolosis | (noun) infestation with the liver fluke Fasciola hepatica; liver damage sometimes occurs; related to liver rot | Synonyms: fascioliasis |
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| femtosecond | (noun) one quadrillionth (10^-15) of a second; one thousandth of a picosecond | - |
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