| 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 |
| 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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| adulterousness | (noun) The quality of being adulterous, involving sexual intercourse by a married person with someone other than their spouse. | - |
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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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| 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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| 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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| 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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| aerology | (noun) meteorology of the total extent of the atmosphere; especially the upper layers | - |
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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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| 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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| 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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| aerophilately | (noun) the collection and study of airmail stamps | - |
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| aerophile | (noun) a lover of aviation | - |
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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 | - |
| 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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| anaerobe | (noun) an organism (especially a bacterium) that does not require air or free oxygen to live | - |
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| androsterone | (noun) an androgenic hormone that is less active than testosterone | - |
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| aneroid | (noun) a barometer that measures pressure without using fluids | Synonyms: aneroid barometer |
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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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| archenteron | (noun) central cavity of the gastrula; becomes the intestinal or digestive cavity | - |
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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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| asteroid | (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) | - |
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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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| 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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| 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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| bacteroid | (noun) a rodlike bacterium (especially any of the rod-shaped or branched bacteria in the root nodules of nitrogen-fixing plants) | - |
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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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| 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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| 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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| calciferol | (noun) a fat-soluble vitamin that prevents rickets | Synonyms: cholecalciferol, D, ergocalciferol, viosterol, vitamin D |
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| casserole | (noun) large deep dish in which food can be cooked and served | - |
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| (noun) food cooked and served in a casserole | - |
| cero | (noun) large edible mackerel of temperate United States coastal Atlantic waters | Synonyms: kingfish, pintado, Scomberomorus regalis |
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| (noun) large mackerel with long pointed snout; important food and game fish of the eastern Atlantic coast southward to Brazil | Synonyms: cavalla, king mackerel, Scomberomorus cavalla |
| cerography | (noun) the art of engraving on a waxed plate on which a printing surface is created by electrotyping. | - |
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| ceroplastics | (noun) the art of modeling in wax. | - |
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| chaperon | (noun) one who accompanies and supervises a young woman or gatherings of young people | Synonyms: chaperone |
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| chaperone | (noun) one who accompanies and supervises a young woman or gatherings of young people | Synonyms: chaperon |
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| cheroot | (noun) a cigar with both ends cut flat | - |
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| cholecalciferol | (noun) a fat-soluble vitamin that prevents rickets | Synonyms: calciferol, D, ergocalciferol, viosterol, vitamin D |
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| cholesterol | (noun) an animal sterol that is normally synthesized by the liver; the most abundant steroid in animal tissues | Synonyms: cholesterin |
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| cicero | (noun) a linear unit of the size of type slightly larger than an em | - |
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| cicerone | (noun) a guide who conducts and informs sightseers | - |
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| cloveroot | (noun) hairy Eurasian plant with small yellow flowers and an astringent root formerly used medicinally | Synonyms: clover-root, Geum urbanum, herb bennet, wood avens |
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| coelenteron | (noun) the saclike body cavity of a coelenterate | - |
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| colpoxerosis | (noun) a condition in which the vagina is unusually dry | - |
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| conqueror | (noun) someone who is victorious by force of arms | Synonyms: vanquisher |
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| corticosteroid | (noun) a steroid hormone produced by the adrenal cortex or synthesized; administered as drugs they reduce swelling and decrease the body's immune response | Synonyms: adrenal cortical steroid, corticoid |
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| corticosterone | (noun) secreted by the adrenal cortex; involved in regulating water and electrolyte balance in the body | - |
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| counteroffensive | (noun) a large scale offensive (more than a counterattack) undertaken by a defending force to seize the initiative from an attacking force | - |
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| counteroffer | (noun) an offer made by someone who has rejected a prior offer | - |
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| crinkleroot | (noun) North American herb with pungent scaly or toothed roots | Synonyms: Cardamine diphylla, crinkle-root, crinkle root, Dentaria diphylla, pepper root, toothwort |
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| curandero | (noun) a Mexican man who practices healing techniques inherited from the Mayans | - |
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| dangerousness | (noun) the quality of not being safe | - |
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| dermatosclerosis | (noun) an autoimmune disease that affects the blood vessels and connective tissue; fibrous connective tissue is deposited in the skin | Synonyms: scleroderma |
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| derogation | (noun) (law) the partial taking away of the effectiveness of a law; a partial repeal or abolition of a law | - |
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| (noun) a communication that belittles somebody or something | Synonyms: depreciation, disparagement |
| deuteron | (noun) the nucleus of deuterium; consists of one proton and one neutron; used as a bombarding particle in accelerators | - |
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| diapheromera | (noun) a variety of stick insect | Synonyms: Diapheromera femorata |
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| diethylstilbesterol | (noun) synthetic nonsteroid with the properties of estrogen; formerly used to treat menstrual problems but was found to be associated with vaginal cancers in the daughters of women so treated during pregnancy | Synonyms: DES, stilbesterol |
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| dinero | (noun) informal terms for money | Synonyms: boodle, bread, cabbage, clams, dough, gelt, kale, lettuce, lolly, loot, lucre, moolah, pelf, scratch, shekels, simoleons, sugar, wampum |
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| dipterocarp | (noun) tree of the family Dipterocarpaceae | - |
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| dipteron | (noun) insects having usually a single pair of functional wings (anterior pair) with the posterior pair reduced to small knobbed structures and mouth parts adapted for sucking or lapping or piercing | Synonyms: dipteran, dipterous insect, two-winged insects |
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| ecdysteroid | (noun) #DD: The name 'ecdysteroid' refers to the insect moulting and sex hormones which include ecdysone and its homologues such as 20-hydroxyecdysone. | - |
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| emperor | (noun) large richly colored butterfly | Synonyms: emperor butterfly |
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| (noun) large moth of temperate forests of Eurasia having heavily scaled transparent wings | Synonyms: emperor moth, Saturnia pavonia |
| (noun) red table grape of California | - |
| (noun) the male ruler of an empire | - |
| enterobacteria | (noun) rod-shaped Gram-negative bacteria; most occur normally or pathogenically in intestines of humans and other animals | Synonyms: enteric bacteria, enterics, entric |
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| enterobiasis | (noun) an infestation with or a resulting infection caused by the pinworm Enterobius vermicularis; occurs especially in children | - |
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| enteroceptor | (noun) any receptor that responds to stimuli inside the body | Synonyms: interoceptor |
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| enterokinase | (noun) enzyme in the intestinal juice that converts inactive trypsinogen into active trypsin | - |
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| enterolith | (noun) a calculus occurring in the intestines | - |
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| enterolithiasis | (noun) the presence of calculi in the intestines | - |
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| enteron | (noun) the alimentary canal (especially of an embryo or a coelenterate) | - |
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| enteropathy | (noun) a disease of the intestinal tract | - |
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| enteroptosis | (noun) an abnormally downward position of the intestines in the abdominal cavity | - |
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