| accelerometer | (noun) an instrument for measuring the acceleration of aircraft or rockets | - |
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| acerola | (noun) acid red or yellow cherry-like fruit of a tropical American shrub very rich in vitamin C | Synonyms: barbados cherry, surinam cherry, West Indian cherry |
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| (noun) tropical American shrub bearing edible acid red fruit resembling cherries | Synonyms: barbados cherry, Malpighia glabra, Surinam cherry, West Indian cherry |
| acerose | (adjective) narrow and long and pointed; as pine leaves | Synonyms: acerate, acicular, needle-shaped |
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| acylglycerol | (noun) an ester of glycerol and fatty acids that occurs naturally as fats and fatty oils | Synonyms: glyceride |
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| adrenosterone | (noun) a steroid having androgenic activity; obtained from the cortex of the adrenal gland | - |
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| adulterous | (adjective) characterized by adultery | Synonyms: extracurricular, extramarital |
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| (adjective) not faithful to a spouse or lover | Synonyms: cheating, two-timing |
| adulterously | (adverb) in an adulterous manner | - |
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| adulterousness | (noun) The quality of being adulterous, involving sexual intercourse by a married person with someone other than their spouse. | - |
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| aeriferous | (adjective) conveying air; as the bronchial tubes | - |
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| aerobatics | (noun) the performance of stunts while in flight in an aircraft | Synonyms: acrobatics, stunt flying, stunting |
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| aerobe | (noun) an organism (especially a bacterium) that requires air or free oxygen for life | - |
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| aerobic | (adjective) depending on free oxygen or air | Synonyms: aerophilic, aerophilous |
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| (adjective) based on or using the principles of aerobics; enhancing respiratory and circulatory efficiency | - |
| aerobics | (noun) exercise that increases the need for oxygen | Synonyms: aerobic exercise |
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| aerobiosis | (noun) life sustained in the presence of air or oxygen | - |
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| aerobiotic | (adjective) living or active only in the presence of oxygen | - |
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| aerodontalgia | (noun) pain in the teeth that results from a change in air pressure (as in flying or mountain climbing) | - |
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| aerodrome | (noun) an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo | Synonyms: airdrome, airport, drome |
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| aerodynamic | (adjective) of or relating to aerodynamics | - |
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| (adjective) designed or arranged to offer the least resistance to fluid flow | Synonyms: flowing, sleek, streamlined |
| aerodynamics | (noun) the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow | Synonyms: aeromechanics |
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| aeroembolism | (noun) obstruction of the circulatory system caused by an air bubble as, e.g., accidentally during surgery or hypodermic injection or as a complication from scuba diving | Synonyms: air embolism, gas embolism |
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| (noun) pain resulting from rapid change in pressure | Synonyms: air embolism, bends, caisson disease, decompression sickness, gas embolism |
| aerofoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: airfoil, control surface, surface |
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| aerogenerator | (noun) generator that extracts usable energy from winds | Synonyms: wind generator, windmill |
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| aerogram | (noun) a letter sent by air mail | Synonyms: aerogramme, air letter, airmail letter |
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| aerogramme | (noun) a letter sent by air mail | Synonyms: aerogram, air letter, airmail letter |
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| aerolite | (noun) a stony meteorite consisting of silicate minerals | - |
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| aerolitic | (adjective) of or pertaining to certain stony meteorites | - |
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| aerological | (adjective) of or pertaining to aerology | - |
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| aerology | (noun) meteorology of the total extent of the atmosphere; especially the upper layers | - |
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| aeromechanic | (adjective) of or pertaining to aerodynamics | - |
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| aeromechanics | (noun) the branch of mechanics that deals with the motion of gases (especially air) and their effects on bodies in the flow | Synonyms: aerodynamics |
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| aeromedical | (adjective) of or relating to aviation medicine | - |
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| aeromedicine | (noun) the study and treatment of disorders associated with flight (especially with space flight) | Synonyms: aerospace medicine, aviation medicine |
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| aeronaut | (noun) someone who operates an aircraft | Synonyms: aviator, flier, flyer |
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| aeronautic | (adjective) of or pertaining to aeronautics | Synonyms: aeronautical |
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| aeronautical | (adjective) of or pertaining to aeronautics | Synonyms: aeronautic |
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| aeronautics | (noun) the theory and practice of navigation through air or space | Synonyms: astronautics |
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| aerophagia | (noun) swallowing air (usually followed by belching and discomfort and flatulence) | - |
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| aerophilatelic | (adjective) of or relating to airmail stamps | - |
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| aerophilately | (noun) the collection and study of airmail stamps | - |
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| aerophile | (noun) a lover of aviation | - |
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| aerophilic | (adjective) depending on free oxygen or air | Synonyms: aerobic, aerophilous |
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| aerophilous | (adjective) depending on free oxygen or air | Synonyms: aerobic, aerophilic |
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| aerophyte | (noun) plant that derives moisture and nutrients from the air and rain; usually grows on another plant but not parasitic on it | Synonyms: air plant, epiphyte, epiphytic plant |
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| aeroplane | (noun) an aircraft that has a fixed wing and is powered by propellers or jets | Synonyms: airplane, plane |
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| aerosol | (noun) a dispenser that holds a substance under pressure and that can release it as a fine spray (usually by means of a propellant gas) | Synonyms: aerosol bomb, aerosol can, aerosol container, spray can |
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| (noun) a cloud of solid or liquid particles in a gas | - |
| aerosolise | (verb) disperse as an aerosol | Synonyms: aerosolize |
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| (verb) become dispersed as an aerosol | Synonyms: aerosolize |
| aerosolised | (adjective) in the form of ultramicroscopic solid or liquid particles dispersed or suspended in air or gas | Synonyms: aerosolized |
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| aerosolize | (verb) disperse as an aerosol | Synonyms: aerosolise |
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| (verb) become dispersed as an aerosol | Synonyms: aerosolise |
| aerosolized | (adjective) in the form of ultramicroscopic solid or liquid particles dispersed or suspended in air or gas | Synonyms: aerosolised |
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| aerospace | (noun) the atmosphere and outer space considered as a whole | - |
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| aileron | (noun) an airfoil that controls lateral motion | - |
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| albuterol | (noun) a bronchodilator (trade names Ventolin or Proventil) used for asthma and emphysema and other lung conditions; available in oral or inhalant forms; side effects are tachycardia and shakiness | Synonyms: Proventil, Ventolin |
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| aldosterone | (noun) a corticosteroid hormone that is secreted by the cortex of the adrenal gland; regulates salt (sodium and potassium) and water balance | - |
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| aldosteronism | (noun) a condition caused by overproduction of aldosterone | Synonyms: hyperaldosteronism |
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| allomerous | (adjective) pertaining to allomerism | - |
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| aluminiferous | (adjective) containing alum or aluminum | - |
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| amentiferous | (adjective) (of plants) bearing or characterized by aments or catkins | Synonyms: amentaceous |
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| anaerobe | (noun) an organism (especially a bacterium) that does not require air or free oxygen to live | - |
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| anaerobic | (adjective) living or active in the absence of free oxygen | Synonyms: anaerobiotic |
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| (adjective) not aerobic | - |
| anaerobiotic | (adjective) living or active in the absence of free oxygen | Synonyms: anaerobic |
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| androsterone | (noun) an androgenic hormone that is less active than testosterone | - |
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| aneroid | (adjective) containing no liquid or actuated without the use of liquid | - |
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| (noun) a barometer that measures pressure without using fluids | Synonyms: aneroid barometer |
| anterograde | (adjective) of amnesia; affecting time immediately following trauma | - |
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| anteroom | (noun) a large entrance or reception room or area | Synonyms: antechamber, entrance hall, foyer, hall, lobby, vestibule |
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| antherozoid | (noun) a motile male gamete of a plant such as an alga or fern or gymnosperm | Synonyms: spermatozoid |
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| antihero | (noun) a protagonist who lacks the characteristics that would make him a hero (or her a heroine) | - |
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| apterous | (adjective) (of insects) without wings | Synonyms: apteral |
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| aquiferous | (adjective) of or relating to an aquifer | - |
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| archenteron | (noun) central cavity of the gastrula; becomes the intestinal or digestive cavity | - |
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| argentiferous | (adjective) containing or yielding silver | - |
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| arteriolosclerosis | (noun) sclerosis of the arterioles | - |
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| arteriosclerosis | (noun) sclerosis of the arterial walls | Synonyms: arterial sclerosis, coronary-artery disease, hardening of the arteries, induration of the arteries |
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| arteriosclerotic | (adjective) affected by arteriosclerosis | - |
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| asteroid | (adjective) shaped like a star | Synonyms: star-shaped |
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| (noun) any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter) | - |
| asteroidal | (adjective) of or relating to or resembling an asteroid | - |
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| atherodyde | (noun) a simple type of jet engine; must be launched at high speed | Synonyms: athodyd, flying drainpipe, ramjet, ramjet engine |
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| atherogenesis | (noun) the formation of atheromas on the walls of the arteries as in atherosclerosis | - |
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| atheroma | (noun) a fatty deposit in the intima (inner lining) of an artery; can obstruct blood flow | - |
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| atheromatic | (adjective) of or relating to or resembling atheroma | Synonyms: atheromatous |
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| atheromatous | (adjective) of or relating to or resembling atheroma | Synonyms: atheromatic |
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| atherosclerosis | (noun) a stage of arteriosclerosis involving fatty deposits (atheromas) inside the arterial walls, thus narrowing the arteries | Synonyms: coronary artery disease |
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| atherosclerotic | (adjective) of or relating to atherosclerosis | - |
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| auriferous | (adjective) containing gold | Synonyms: gold-bearing |
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| autoerotic | (adjective) sexually satisfying yourself (as by masturbation) | - |
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| autoeroticism | (noun) using your own body as a sexual object | Synonyms: autoerotism |
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| autoerotism | (noun) using your own body as a sexual object | Synonyms: autoeroticism |
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| axerophthol | (noun) any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes | Synonyms: A, antiophthalmic factor, vitamin A |
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| bacciferous | (adjective) producing or bearing berries | Synonyms: baccate, berried |
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| bacteroid | (adjective) resembling bacteria | Synonyms: bacterioid, bacterioidal, bacteroidal |
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| (noun) a rodlike bacterium (especially any of the rod-shaped or branched bacteria in the root nodules of nitrogen-fixing plants) | - |
| bacteroidal | (adjective) resembling bacteria | Synonyms: bacterioid, bacterioidal, bacteroid |
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| banderillero | (noun) the bullfighter who implants decorated darts (banderillas) into the neck or shoulders of the bull during a bull fight | - |
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| beroe | (noun) delicately iridescent thimble-shaped ctenophores | - |
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| blusterous | (adjective) blowing in violent and abrupt bursts | Synonyms: blustering, blustery |
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| boisterous | (adjective) noisy and lacking in restraint or discipline | Synonyms: rambunctious, robustious, rumbustious, unruly |
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| (adjective) full of rough and exuberant animal spirits | Synonyms: knockabout |
| (adjective) violently agitated and turbulent | Synonyms: fierce, rough |
| boisterously | (adverb) in a carefree manner | Synonyms: rollickingly |
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| boisterousness | (noun) the property of being noisy and lively and unrestrained | - |
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| (noun) a turbulent and stormy state of the sea | - |
| bolero | (noun) a Spanish dance in triple time accompanied by guitar and castanets | - |
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| (noun) a short jacket; worn mostly by women | - |
| (noun) music written in the rhythm of the bolero dance | - |
| bracero | (noun) a Mexican laborer who worked in the United States on farms and railroads in order to ease labor shortages during World War II | - |
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| brachypterous | (adjective) (especially of certain insects) having very short or rudimentary wings | Synonyms: short-winged |
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| buckeroo | (noun) local names for a cowboy (`vaquero' is used especially in southwestern and central Texas and `buckaroo' is used especially in California) | Synonyms: buckaroo, vaquero |
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