| envelope | (noun) any wrapper or covering | - |
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| (noun) a flat (usually rectangular) container for a letter, thin package, etc. | - |
| (noun) the bag containing the gas in a balloon | Synonyms: gasbag |
| (noun) the maximum operating capability of a system (especially an aircraft) | - |
| (noun) a natural covering (as by a fluid) | - |
| (noun) a curve that is tangent to each of a family of curves | - |
| envelopment | (noun) the act of enclosing something inside something else | Synonyms: enclosing, enclosure, inclosure |
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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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| ephemeropteran | (noun) short-lived insect | Synonyms: ephemerid |
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| epidiascope | (noun) an optical projector that gives images of both transparent and opaque objects | - |
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| epikeratophakia | (noun) using a piece of donated corneal tissue to repair the eye of someone who has had a cataract removed | - |
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| episcopacy | (noun) the collective body of bishops | Synonyms: episcopate |
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| episcopate | (noun) the office and dignity of a bishop | Synonyms: bishopry |
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| (noun) the collective body of bishops | Synonyms: episcopacy |
| (noun) the territorial jurisdiction of a bishop | Synonyms: bishopric, diocese |
| (noun) the term of office of a bishop | - |
| epistrophe | (noun) repetition of the ends of two or more successive sentences, verses, etc. | Synonyms: epiphora |
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| epitope | (noun) the site on the surface of an antigen molecule to which an antibody attaches itself | Synonyms: antigenic determinant, determinant |
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| ergotropism | (noun) an affinity for work | - |
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| erythropoiesis | (noun) the process of producing red blood cells by the stem cells in the bone marrow | - |
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| erythropoietin | (noun) a glycoprotein secreted by the kidneys that stimulates the production of red blood cells | - |
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| escallop | (noun) edible marine bivalve having a fluted fan-shaped shell that swim by expelling water from the shell in a series of snapping motions | Synonyms: scallop, scollop |
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| (noun) edible muscle of mollusks having fan-shaped shells; served broiled or poached or in salads or cream sauces | Synonyms: scallop, scollop |
| (noun) thin slice of meat (especially veal) usually fried or broiled | Synonyms: cutlet, scallop, scollop |
| esophagitis | (noun) inflammation of the esophagus; often caused by gastroesophageal reflux | Synonyms: oesophagitis |
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| esophagoscope | (noun) an optical instrument for examining the inside of the esophagus | Synonyms: oesophagoscope |
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| esophagus | (noun) the passage between the pharynx and the stomach | Synonyms: gorge, gullet, oesophagus |
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| esotropia | (noun) strabismus in which one or both eyes turn inward toward the nose | Synonyms: convergent strabismus, cross-eye, crossed eye |
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| estoppel | (noun) a rule of evidence whereby a person is barred from denying the truth of a fact that has already been settled | - |
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| euglenophyte | (noun) marine and freshwater green or colorless flagellate organism | Synonyms: euglenid, euglenoid |
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| euronithopod | (noun) widespread group including duck-billed dinosaurs and their early relatives (hadrosaurs, trachodon and iguanodon) | Synonyms: Euronithopoda, Ornithopoda, suborder Euronithopoda, suborder Ornithopoda |
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| europhilia | (noun) admiration for Europe, Europeans, or the European Union. | - |
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| europium | (noun) a bivalent and trivalent metallic element of the rare earth group | Synonyms: atomic number 63, Eu |
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| eutrophication | (noun) excessive nutrients in a lake or other body of water, usually caused by runoff of nutrients (animal waste, fertilizers, sewage) from the land, which causes a dense growth of plant life; the decomposition of the plants depletes the supply of oxygen, leading to the death of animal life | - |
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| exaflop | (noun) (computer science) a unit for measuring the speed of a computer system, equal to one quintillion floating-point operations a second. | Synonyms: EFLOPS |
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| exophthalmos | (noun) protrusion of the eyeball from the socket | - |
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| exoplanet | (noun) A planet which exists outside Earth's solar system | - |
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| exotropia | (noun) strabismus in which one or both eyes are directed outward | Synonyms: divergent strabismus, walleye |
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| expropriation | (noun) taking out of an owner's hands (especially taking property by public authority) | - |
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| extropy | (noun) the prediction that human intelligence and technology will enable life to expand in an orderly way throughout the entire universe | - |
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| eyedrop | (noun) a method of irrigating the eye used by ophthalmologists | Synonyms: eye-drop |
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| (noun) a drop from an eye dropper | Synonyms: eye-drop |
| fasciolopsiasis | (noun) infestation with the large intestinal fluke Fasciolopsis buski; common in eastern Asia | - |
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| feathertop | (noun) northeastern tropical African plant having feathery panicles | Synonyms: feathertop grass, Pennistum villosum |
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| (noun) a variety of reed grass | Synonyms: Calamagrostis acutiflora, feather reed grass |
| fenoprofen | (noun) a nonsteroidal anti-inflammatory drug (trade name Nalfon) used in the treatment of arthritis and other painful inflammatory disorders | Synonyms: fenoprofen calcium, Nalfon |
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| fetoprotein | (noun) any of several antigens that occur naturally in the fetus and sometimes in adults with cancer | Synonyms: foetoprotein |
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| fetoscope | (noun) a stethoscope placed on the pregnant woman's abdomen to listen for the fetal heartbeat | Synonyms: foetoscope |
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| fetoscopy | (noun) prenatal diagnosis that allows direct observation of a fetus in the uterus and the withdrawal of fetal blood | Synonyms: foetoscopy |
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| fiberoptics | (noun) the transmission of light signals via glass fibers | Synonyms: fiber optics, fibre optics, fibreoptics |
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| fiberscope | (noun) a flexible medical instrument involving fiber optics that is used to examine internal organs | - |
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| fibreoptics | (noun) the transmission of light signals via glass fibers | Synonyms: fiber optics, fiberoptics, fibre optics |
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| fibrinopeptide | (noun) peptide released from the amino end of fibrinogen by the action of thrombin to form fibrin during clotting of the blood | - |
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| flattop | (noun) a large warship that carries planes and has a long flat deck for takeoffs and landings | Synonyms: aircraft carrier, attack aircraft carrier, carrier |
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| (noun) a closely cropped haircut; usually for men or boys | Synonyms: butch, crew cut |
| flop | (noun) the act of throwing yourself down; collapse; sink | Synonyms: collapse |
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| (noun) a complete failure | Synonyms: bust, fizzle |
| (noun) someone who is unsuccessful | Synonyms: dud, washout |
| (noun) an arithmetic operation performed on floating-point numbers | Synonyms: floating-point operation |
| flophouse | (noun) a cheap lodging house | Synonyms: dosshouse |
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| floppy | (noun) a small plastic magnetic disk enclosed in a stiff envelope with a radial slit; used to store data or programs for a microcomputer | Synonyms: diskette, floppy disk |
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| fluoroscope | (noun) an X-ray machine that combines an X-ray source and a fluorescent screen to enable direct observation | Synonyms: roentgenoscope |
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| fluoroscopy | (noun) examination of body structures using a fluoroscope | - |
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| foetoprotein | (noun) any of several antigens that occur naturally in the fetus and sometimes in adults with cancer | Synonyms: fetoprotein |
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| foetoscope | (noun) a stethoscope placed on the pregnant woman's abdomen to listen for the fetal heartbeat | Synonyms: fetoscope |
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| foetoscopy | (noun) prenatal diagnosis that allows direct observation of a fetus in the uterus and the withdrawal of fetal blood | Synonyms: fetoscopy |
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| fop | (noun) a man who is much concerned with his dress and appearance | Synonyms: beau, clotheshorse, dandy, dude, fashion plate, gallant, sheik, swell |
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| foppishness | (noun) the manner and dress of a fop or dandy | Synonyms: dandyism |
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| foretop | (noun) a lock of a horse's mane that grows forward between the ears | Synonyms: forelock |
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| (noun) a platform at the head of a foremast | - |
| froghopper | (noun) a variety of spittlebug | - |
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| gallop | (noun) a fast gait of a horse; a two-beat stride during which all four legs are off the ground simultaneously | - |
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| galop | (noun) music suitable for a galop dance | - |
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| gametophore | (noun) a modified branch bearing gametangia as in the thalloid liverworts | - |
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| gametophyte | (noun) the gamete-bearing individual or phase in the life cycle of a plant having alternation of generations | - |
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| gammopathy | (noun) a disturbance in the synthesis of immunoglobulins; proteins having antibody activity increase greatly in the blood | - |
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| gastropod | (noun) a class of mollusks typically having a one-piece coiled shell and flattened muscular foot with a head bearing stalked eyes | Synonyms: univalve |
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| gastroscope | (noun) a type of endoscope for visually examining the stomach | - |
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| gastroscopy | (noun) visual examination of the stomach by means of a gastroscope inserted through the esophagus | - |
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| geophagia | (noun) eating earth, clay, chalk; occurs in some primitive tribes, sometimes in cases of nutritional deficiency or obsessive behavior | Synonyms: geophagy |
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| geophagy | (noun) eating earth, clay, chalk; occurs in some primitive tribes, sometimes in cases of nutritional deficiency or obsessive behavior | Synonyms: geophagia |
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| geophysicist | (noun) a geologist who uses physical principles to study the properties of the earth | - |
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| geophysics | (noun) geology that uses physical principles to study properties of the earth | Synonyms: geophysical science |
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| geophyte | (noun) a perennial plant that propagates by underground bulbs or tubers or corms | - |
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| geopolitics | (noun) the study of the effects of economic geography on the powers of the state | - |
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| geotropism | (noun) an orienting response to gravity | - |
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| gigaflop | (noun) a unit of measure for the calculating speed of a computer equal to one billion floating point operations per second. | Synonyms: billion floating point operations per second, GFLOPS |
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| glop | (noun) writing or music that is excessively sweet and sentimental | Synonyms: mush, slop, treacle |
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| (noun) any gummy shapeless matter; usually unpleasant | - |
| glossoptosis | (noun) abnormal downward or back placement of the tongue | - |
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| glycoprotein | (noun) a conjugated protein having a carbohydrate component | - |
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| gnathopod | (noun) One of a set of three paired appendages on the thorax of a decapod crustacean, located just posterior to the maxillae and used in feeding. | Synonyms: maxilliped |
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| gonadotrophin | (noun) hormone secreted by the anterior pituitary gland and placenta; stimulates the gonads and controls reproductive activity | Synonyms: gonadotrophic hormone, gonadotropic hormone, gonadotropin |
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| gonadotropin | (noun) hormone secreted by the anterior pituitary gland and placenta; stimulates the gonads and controls reproductive activity | Synonyms: gonadotrophic hormone, gonadotrophin, gonadotropic hormone |
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| gonioscopy | (noun) an examination of the front part of the eye to check the angle where the iris meets the cornea; it is used to distinguish between open-angle glaucoma and closed-angle glaucoma | - |
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| goop | (noun) street names for gamma hydroxybutyrate | Synonyms: easy lay, Georgia home boy, grievous bodily harm, liquid ecstasy, max, scoop, soap |
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| (noun) any thick, viscous matter | Synonyms: goo, gook, guck, gunk, muck, ooze, slime, sludge |
| gopher | (noun) burrowing rodent of the family Geomyidae having large external cheek pouches; of Central America and southwestern North America | Synonyms: pocket gopher, pouched rat |
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| (noun) burrowing edible land tortoise of southeastern North America | Synonyms: gopher tortoise, gopher turtle, Gopherus polypemus |
| (noun) any of various terrestrial burrowing rodents of Old and New Worlds; often destroy crops | Synonyms: ground squirrel, spermophile |
| (noun) a zealously energetic person (especially a salesman) | Synonyms: goffer |
| gopherwood | (noun) small handsome roundheaded deciduous tree having showy white flowers in terminal clusters and heavy hardwood yielding yellow dye | Synonyms: Cladrastis kentukea, Cladrastis lutea, Kentucky yellowwood |
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| gramophone | (noun) an antique record player; the sound of the vibrating needle is amplified acoustically | Synonyms: acoustic gramophone |
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| granulocytopenia | (noun) an acute blood disorder (often caused by radiation or drug therapy) characterized by severe reduction in granulocytes | Synonyms: agranulocytosis, agranulosis |
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| grasshopper | (noun) terrestrial plant-eating insect with hind legs adapted for leaping | Synonyms: hopper |
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| (noun) a cocktail made of creme de menthe and cream (sometimes with creme de cacao) | - |
| grope | (noun) the act of groping; and instance of groping | - |
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| gumdrop | (noun) a jellied candy coated with sugar crystals | - |
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| gymnosophist | (noun) member of a Hindu sect practicing gymnosophy (especially nudism) | - |
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| gymnosophy | (noun) the doctrine of a sect of Hindu philosophers who practiced nudity and asceticism and meditation | - |
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| gynophobia | (noun) a morbid fear of women | - |
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| gynophore | (noun) the stalk of a pistil that raises it above the receptacle | - |
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| gyroplane | (noun) an aircraft that is supported in flight by unpowered rotating horizontal wings (or blades); forward propulsion is provided by a conventional propeller | Synonyms: autogiro, autogyro |
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| gyroscope | (noun) rotating mechanism in the form of a universally mounted spinning wheel that offers resistance to turns in any direction | Synonyms: gyro |
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| haematocytopenia | (noun) an abnormally low number of red blood cells in the blood | Synonyms: hematocytopenia |
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| haematopoiesis | (noun) the formation of blood cells in the living body (especially in the bone marrow) | Synonyms: haematogenesis, haemogenesis, haemopoiesis, hematogenesis, hematopoiesis, hemogenesis, hemopoiesis, sanguification |
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| haemoglobinopathy | (noun) a blood disease characterized by the presence of abnormal hemoglobins in the blood | Synonyms: hemoglobinopathy |
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| haemophile | (noun) someone who has hemophilia and is subject to uncontrollable bleeding | Synonyms: bleeder, haemophiliac, hemophile, hemophiliac |
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| haemophilia | (noun) congenital tendency to uncontrolled bleeding; usually affects males and is transmitted from mother to son | Synonyms: bleeder's disease, hemophilia |
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| haemophiliac | (noun) someone who has hemophilia and is subject to uncontrollable bleeding | Synonyms: bleeder, haemophile, hemophile, hemophiliac |
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