| electrocardiography | (noun) diagnostic procedure consisting of recording the activity of the heart electronically with a cardiograph (and producing a cardiogram) | Synonyms: cardiography |
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| electrocautery | (noun) application of a needle heated by an electric current to destroy tissue (as to remove warts) | - |
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| electrochemistry | (noun) branch of chemistry that deals with the chemical action of electricity and the production of electricity by chemical reactions | - |
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| electrocution | (noun) killing by electric shock | - |
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| (noun) execution by electricity | Synonyms: burning |
| electrocutioner | (noun) an executioner who uses electricity to kill the condemned person | - |
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| electrolocation | (noun) The use of electroreception to locate surrounding objects. | - |
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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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| elocution | (noun) an expert manner of speaking involving control of voice and gesture | - |
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| elocutionist | (noun) a public speaker trained in voice production and gesture and delivery | - |
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| embrocation | (noun) a medicinal liquid that is rubbed into the skin to relieve muscular stiffness and pain | Synonyms: liniment |
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| encephalocele | (noun) protrusion of brain tissue through a congenital fissure in the skull | - |
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| endocarditis | (noun) inflammation of the endocardium and heart valves | - |
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| endocardium | (noun) the membrane that lines the cavities of the heart and forms part of the heart valves | - |
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| endocarp | (noun) the hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed | Synonyms: pit, stone |
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| endocervicitis | (noun) inflammation of the mucous lining of the uterine cervix | - |
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| endocranium | (noun) membrane lining the inside of the skull | - |
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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 |
| endocrinologist | (noun) physician who specializes in the diagnosis and treatment of conditions affecting the endocrine system | - |
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| endocrinology | (noun) the branch of medicine dealing with the endocrine glands and their secretions | - |
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| enteroceptor | (noun) any receptor that responds to stimuli inside the body | Synonyms: interoceptor |
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| entoproct | (noun) any of various moss-like aquatic animals usually forming branching colonies; each polyp having a both mouth and anus within a closed ring of tentacles | - |
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| epoch | (noun) a period marked by distinctive character or reckoned from a fixed point or event | Synonyms: era |
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| (noun) a unit of geological time that is a subdivision of a period and is itself divided into ages | - |
| (noun) (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded | Synonyms: date of reference |
| equinoctial | (noun) the great circle on the celestial sphere midway between the celestial poles | Synonyms: celestial equator, equinoctial circle, equinoctial line |
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| equivocalness | (noun) unclearness by virtue of having more than one meaning | Synonyms: ambiguity |
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| equivocation | (noun) falsification by means of vague or ambiguous language | Synonyms: tergiversation |
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| (noun) intentionally vague or ambiguous | Synonyms: evasiveness, prevarication |
| (noun) a statement that is not literally false but that cleverly avoids an unpleasant truth | Synonyms: evasion |
| equivocator | (noun) a respondent who avoids giving a clear direct answer | Synonyms: hedger, tergiversator |
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| ergocalciferol | (noun) a fat-soluble vitamin that prevents rickets | Synonyms: calciferol, cholecalciferol, D, viosterol, vitamin D |
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| erythrocyte | (noun) a mature blood cell that contains hemoglobin to carry oxygen to the bodily tissues; a biconcave disc that has no nucleus | Synonyms: RBC, red blood cell |
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| erythrocytolysin | (noun) any substance that can cause lysis (destruction) of erythrocytes (red blood cells) and the release of their hemoglobin | Synonyms: erythrolysin, haemolysin, hemolysin |
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| ethnocentrism | (noun) belief in the superiority of one's own ethnic group | - |
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| evocation | (noun) imaginative re-creation | - |
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| (noun) stimulation that calls up (draws forth) a particular class of behaviors | Synonyms: elicitation, induction |
| (noun) calling up supposed supernatural forces by spells and incantations | Synonyms: summoning |
| exocarp | (noun) outermost layer of the pericarp of fruits as the skin of a peach or grape | Synonyms: epicarp |
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| exocrine | (noun) a gland that secretes externally through a duct | Synonyms: duct gland, exocrine gland |
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| exteroception | (noun) sensitivity to stimuli originating outside of the body | - |
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| exteroceptor | (noun) any receptor that responds to stimuli outside the body | - |
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| feedstock | (noun) the raw material that is required for some industrial process | - |
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| femtochemistry | (noun) the branch of chemistry that studies elementary (often very fast) chemical reactions as they occur; the experimental methods are often based on the use of femtosecond laser pulses | - |
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| ferociousness | (noun) the trait of extreme cruelty | Synonyms: brutality, savagery, viciousness |
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| ferocity | (noun) the property of being wild or turbulent | Synonyms: fierceness, furiousness, fury, vehemence, violence, wildness |
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| ferrocerium | (noun) a pyrophoric alloy of iron with cerium; used for lighter flints | - |
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| ferroconcrete | (noun) concrete with metal and/or mesh added to provide extra support against stresses | Synonyms: reinforced concrete |
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| ferrocyanide | (noun) salt of ferrocyanic acid usually obtained by a reaction of a cyanide with iron sulphate | - |
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| fetlock | (noun) projection behind and above a horse's hoof | - |
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| (noun) the joint between the cannon bone and the pastern | Synonyms: fetlock joint |
| fibrocartilage | (noun) cartilage that is largely composed of fibers like those in ordinary connective tissue | - |
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| finocchio | (noun) aromatic bulbous stem base eaten cooked or raw in salads | Synonyms: fennel, Florence fennel |
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| firelock | (noun) a muzzle loader that had a flintlock type of gunlock | Synonyms: flintlock |
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| flintlock | (noun) an obsolete gunlock that has flint embedded in the hammer; the flint makes a spark that ignites the charge | - |
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| (noun) a muzzle loader that had a flintlock type of gunlock | Synonyms: firelock |
| floc | (noun) a small loosely aggregated mass of flocculent material suspended in or precipitated from a liquid | Synonyms: floccule |
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| flocculation | (noun) the process of flocculating; forming woolly cloudlike aggregations | - |
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| flocculator | (noun) An apparatus used in the process of flocculation. | - |
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| floccule | (noun) a small loosely aggregated mass of flocculent material suspended in or precipitated from a liquid | Synonyms: floc |
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| flock | (noun) a group of birds | - |
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| (noun) a group of sheep or goats | Synonyms: fold |
| (noun) a church congregation guided by a pastor | - |
| (noun) an orderly crowd | Synonyms: troop |
| (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, good deal, great deal, hatful, heap, lot, mass, mess, mickle, mint, mountain, muckle, passel, peck, pile, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum, wad |
| fluorocarbon | (noun) a halocarbon in which some hydrogen atoms have been replaced by fluorine; used in refrigerators and aerosols | - |
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| fluorochrome | (noun) any of various fluorescent substances used in fluorescence microscopy to stain specimens | - |
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| focalisation | (noun) the act of bringing into focus | Synonyms: focalization, focusing |
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| (noun) the confinement of an infection to a limited area | Synonyms: focalization |
| focalization | (noun) the act of bringing into focus | Synonyms: focalisation, focusing |
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| (noun) the confinement of an infection to a limited area | Synonyms: focalisation |
| focus | (noun) maximum clarity or distinctness of an image rendered by an optical system | - |
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| (noun) maximum clarity or distinctness of an idea | - |
| (noun) the concentration of attention or energy on something | Synonyms: centering, centring, direction, focal point, focusing, focussing |
| (noun) a fixed reference point on the concave side of a conic section | - |
| (noun) a point of convergence of light (or other radiation) or a point from which it diverges | Synonyms: focal point |
| (noun) a central point or locus of an infection in an organism | Synonyms: focal point, nidus |
| (noun) special emphasis attached to something | Synonyms: stress |
| focusing | (noun) the act of bringing into focus | Synonyms: focalisation, focalization |
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| (noun) the concentration of attention or energy on something | Synonyms: centering, centring, direction, focal point, focus, focussing |
| focussing | (noun) the concentration of attention or energy on something | Synonyms: centering, centring, direction, focal point, focus, focusing |
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| footlocker | (noun) a trunk for storing personal possessions; usually kept at the foot of a bed (as in a barracks) | Synonyms: locker |
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| forelock | (noun) a lock of a horse's mane that grows forward between the ears | Synonyms: foretop |
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| (noun) a lock of hair growing (or falling) over the forehead | - |
| foreshock | (noun) a tremor preceding an earthquake | - |
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| frock | (noun) a one-piece garment for a woman; has skirt and bodice | Synonyms: dress |
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| (noun) a habit worn by clerics | - |
| (noun) a long, loose outer garment | - |
| galactocele | (noun) a cystic tumor containing milk or a milky substance (especially in the mammary glands) | - |
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| gamecock | (noun) a cock bred and trained for fighting | Synonyms: fighting cock |
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| (noun) someone who is a very fierce fighter | Synonyms: hell-kite, hell-rooster |
| gametocyte | (noun) an immature animal or plant cell that develops into a gamete by meiosis | - |
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| gangliocyte | (noun) a nerve cell whose body is outside the central nervous system | Synonyms: ganglion cell |
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| gastrocnemius | (noun) the muscle in the back part of the leg that forms the greater part of the calf; responsible for the plantar flexion of the foot | Synonyms: gastrocnemius muscle |
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| genocide | (noun) systematic killing of a racial or cultural group | Synonyms: race murder, racial extermination |
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| geochemistry | (noun) the chemistry of the earth's crust | - |
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| gerontocracy | (noun) a political system governed by old men | - |
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| glochid | (noun) a barbed spine or bristle (often tufted on cacti) | Synonyms: glochidium |
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| glochidium | (noun) a barbed spine or bristle (often tufted on cacti) | Synonyms: glochid |
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| glockenspiel | (noun) a percussion instrument consisting of a set of graduated metal bars mounted on a frame and played with small hammers | Synonyms: orchestral bells |
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| glottochronology | (noun) the determination of how long ago different languages evolved from a common source language | - |
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| glucocorticoid | (noun) a steroid hormone that is produced by the adrenal cortex of animals; affects functioning of gonads and has anti-inflammatory activity | - |
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| gnocchi | (noun) (Italian) a small dumpling made of potato or flour or semolina that is boiled or baked and is usually served with a sauce or with grated cheese | - |
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| goldilocks | (noun) early-flowering perennial of southern and southeastern Europe with flower heads resembling those of goldenrod | Synonyms: Aster linosyris, goldilocks aster, Linosyris vulgaris |
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| gonococcus | (noun) the pus-producing bacterium that causes gonorrhea | Synonyms: Neisseria gonorrhoeae |
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| granulocyte | (noun) a leukocyte that has granules in its cytoplasm | - |
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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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| greengrocer | (noun) a grocer who sells fresh fruits and vegetables | - |
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| greengrocery | (noun) a greengrocer's grocery store | - |
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| (noun) groceries sold by a greengrocer | - |
| greenockite | (noun) ore of cadmium; a rare yellowish mineral consisting of cadmium sulphide in crystalline form | Synonyms: cadmium sulphide |
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| gridlock | (noun) a traffic jam so bad that no movement is possible | - |
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| gritrock | (noun) a hard coarse-grained siliceous sandstone | Synonyms: grit, gritstone |
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| grocer | (noun) a retail merchant who sells foodstuffs (and some household supplies) | - |
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| grocery | (noun) a marketplace where groceries are sold | Synonyms: food market, grocery store, market |
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| (noun) (usually plural) consumer goods sold by a grocer | Synonyms: foodstuff |
| guilloche | (noun) an architectural decoration formed by two intersecting wavy bands | - |
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| gunlock | (noun) the action that ignites the charge in a firearm | Synonyms: firing mechanism |
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| gunstock | (noun) the handle of a handgun or the butt end of a rifle or shotgun or part of the support of a machine gun or artillery gun | Synonyms: stock |
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| gynecocracy | (noun) a political system governed by a woman | Synonyms: gynarchy |
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| gyrocompass | (noun) a compass that does not depend on magnetism but uses a gyroscope instead | - |
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| haddock | (noun) important food fish on both sides of the Atlantic; related to cod but usually smaller | Synonyms: Melanogrammus aeglefinus |
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| (noun) lean white flesh of fish similar to but smaller than cod; usually baked or poached or as fillets sauteed or fried | - |
| haematocele | (noun) swelling caused by blood collecting in a body cavity (especially a swelling of the membrane covering the testis) | Synonyms: haematocoele, hematocele, hematocoele |
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| haematochezia | (noun) passage of stools containing blood (as from diverticulosis or colon cancer or peptic ulcer) | Synonyms: hematochezia |
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| haematocoele | (noun) swelling caused by blood collecting in a body cavity (especially a swelling of the membrane covering the testis) | Synonyms: haematocele, hematocele, hematocoele |
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| haematocolpometra | (noun) accumulation of blood in the vagina and uterus | Synonyms: hematocolpometra |
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| haematocolpos | (noun) accumulation of menstrual blood in the vagina (usually due to an imperforate hymen) | Synonyms: hematocolpos |
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| haematocrit | (noun) a measuring instrument to determine (usually by centrifugation) the relative amounts of corpuscles and plasma in the blood | Synonyms: hematocrit |
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| (noun) the ratio of the volume occupied by packed red blood cells to the volume of the whole blood as measured by a hematocrit | Synonyms: hematocrit, packed cell volume |