| abetalipoproteinemia | (noun) a rare inherited disorder of fat metabolism; characterized by severe deficiency of beta-lipoproteins and abnormal red blood cells (acanthocytes) and abnormally low cholesterol levels | - |
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| abiotrophy | (noun) a loss of vitality and a degeneration of cells and tissues not due to any apparent injury | - |
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| abrocome | (noun) ratlike rodent with soft fur and large ears of the Andes | Synonyms: chinchilla rat, rat chinchilla |
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| abrogation | (noun) the act of abrogating; an official or legal cancellation | Synonyms: annulment, repeal |
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| abrogator | (noun) an authority or official empowered to abolish or annul or repeal | - |
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| acarophobia | (noun) a morbid fear of small insects and mites and worms | - |
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| accelerometer | (noun) an instrument for measuring the acceleration of aircraft or rockets | - |
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| accroides | (noun) an alcohol-soluble resin from Australian trees; used in varnishes and in manufacturing paper | Synonyms: acaroid resin, accaroid resin, accroides gum, accroides resin, gum accroides |
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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 |
| achondroplasia | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasty, chondrodystrophy, osteosclerosis congenita |
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| achondroplasty | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasia, chondrodystrophy, osteosclerosis congenita |
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| achromasia | (noun) unnatural lack of color in the skin (as from bruising or sickness or emotional distress) | Synonyms: lividity, lividness, luridness, paleness, pallidness, pallor, wanness |
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| achromaticity | (noun) the visual property of being without chromatic color | Synonyms: achromatism, colorlessness, colourlessness |
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| achromatin | (noun) the part of a cell nucleus that is relatively uncolored by stains or dyes | - |
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| achromatism | (noun) the visual property of being without chromatic color | Synonyms: achromaticity, colorlessness, colourlessness |
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| achromia | (noun) an absence of normal pigmentation especially in the skin (as in albinism) or in red blood cells | - |
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| acroanaesthesia | (noun) loss of sensation in the extremities | Synonyms: acroanesthesia |
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| acroanesthesia | (noun) loss of sensation in the extremities | Synonyms: acroanaesthesia |
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| acrobat | (noun) an athlete who performs acts requiring skill and agility and coordination | - |
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| acrobatics | (noun) the gymnastic moves of an acrobat | Synonyms: tumbling |
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| (noun) the performance of stunts while in flight in an aircraft | Synonyms: aerobatics, stunt flying, stunting |
| acrocarp | (noun) a moss in which the main axis is terminated by the archegonium (and hence the capsule) | Synonyms: acrocarpous moss |
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| acrocephaly | (noun) a congenital abnormality of the skull; the top of the skull assumes a cone shape | Synonyms: oxycephaly |
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| acrocyanosis | (noun) cyanosis of the extremities; can occur when a spasm of the blood vessels is caused by exposure to cold or by strong emotion | Synonyms: Raynaud's sign |
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| acrodont | (noun) an animal having teeth consolidated with the summit of the alveolar ridge without sockets | - |
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| acrogen | (noun) any flowerless plant such as a fern (pteridophyte) or moss (bryophyte) in which growth occurs only at the tip of the main stem | - |
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| acrolein | (noun) a pungent colorless unsaturated liquid aldehyde made from propene | Synonyms: propenal |
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| acromegalia | (noun) enlargement of bones of hands and feet and face; often accompanied by headache and muscle pain and emotional disturbances; caused by overproduction of growth hormone by the anterior pituitary gland (due to a tumor) | Synonyms: acromegaly |
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| acromegaly | (noun) enlargement of bones of hands and feet and face; often accompanied by headache and muscle pain and emotional disturbances; caused by overproduction of growth hormone by the anterior pituitary gland (due to a tumor) | Synonyms: acromegalia |
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| acromicria | (noun) abnormally small extremities (underdeveloped fingers and toes) | Synonyms: acromikria |
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| acromikria | (noun) abnormally small extremities (underdeveloped fingers and toes) | Synonyms: acromicria |
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| acromion | (noun) the outermost point of the spine of the shoulder blade | Synonyms: acromial process |
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| acromphalus | (noun) abnormal protrusion of the navel; sometimes the start of umbilical hernia | - |
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| acromyotonia | (noun) myotonia of the extremities only; causes spastic deformity of the hand or foot | - |
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| acronym | (noun) a word formed from the initial letters of the several words in the name and pronounced as one word | Synonyms: initialism |
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| acrophobia | (noun) a morbid fear of great heights | - |
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| acrophony | (noun) naming a letter of the alphabet by using a word whose initial sound is the sound represented by that letter | - |
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| acropolis | (noun) the citadel in ancient Greek towns | - |
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| acrosome | (noun) a process at the anterior end of a sperm cell that produces enzymes to facilitate penetration of the egg | - |
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| acrostic | (noun) a puzzle where you fill a square grid with words reading the same down as across | Synonyms: word square |
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| (noun) verse in which certain letters such as the first in each line form a word or message | - |
| acylglycerol | (noun) an ester of glycerol and fatty acids that occurs naturally as fats and fatty oils | Synonyms: glyceride |
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| adiaphoron | (noun) (Stoic philosophy) a matter having no moral merit or demerit. | - |
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| (noun) a religious ceremonial or ritual observance that is held to be an affair of the individual conscience because it is neither forbidden nor enjoined by the scriptures. | - |
| adrenocorticotrophin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotropic hormone, adrenocorticotropin, corticotrophin, corticotropin |
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| adrenocorticotropin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotrophin, adrenocorticotropic hormone, corticotrophin, corticotropin |
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| adrenosterone | (noun) a steroid having androgenic activity; obtained from the cortex of the adrenal gland | - |
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| adroitness | (noun) skillful performance or ability without difficulty | Synonyms: adeptness, deftness, facility, quickness |
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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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| adventurousness | (noun) the trait of being adventurous | Synonyms: venturesomeness |
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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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| affront | (noun) a deliberately offensive act or something producing the effect of deliberate disrespect | Synonyms: insult |
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| afropavo | (noun) both sexes are brightly colored | Synonyms: Afropavo congensis, Congo peafowl |
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| aggro | (noun) (informal British usage) aggravation or aggression | - |
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| agitprop | (noun) political propaganda (especially communist propaganda) communicated via art and literature and cinema | - |
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| agrobiology | (noun) the study of plant nutrition and growth especially as a way to increase crop yield | - |
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| agrology | (noun) science of soils in relation to crops | - |
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| agromania | (noun) an intense desire to be alone or out in the open | - |
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| agronomist | (noun) an expert in soil management and field-crop production | - |
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| agronomy | (noun) the application of soil and plant sciences to land management and crop production | Synonyms: scientific agriculture |
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| aileron | (noun) an airfoil that controls lateral motion | - |
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| ailurophobia | (noun) a morbid fear of cats | - |
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| airdrome | (noun) an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo | Synonyms: aerodrome, airport, drome |
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| airdrop | (noun) delivery of supplies or equipment or personnel by dropping them by parachute from an aircraft | - |
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| albatross | (noun) large web-footed birds of the Southern Hemisphere having long narrow wings; noted for powerful gliding flight | Synonyms: mollymawk |
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| (noun) (figurative) something that hinders or handicaps | Synonyms: millstone |
| 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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| aldotetrose | (noun) A four-carbon aldose; for example, threose, erythrose. | - |
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| alendronate | (noun) a tablet (trade name Fosamax) prescribed to prevent or treat osteoporosis in women after menopause | Synonyms: Fosamax |
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| aleurone | (noun) granular protein in outermost layer of endosperm of many seeds or cereal grains | - |
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| algarobilla | (noun) mesquite pod used in tanning and dyeing | Synonyms: algarroba, algarrobilla |
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| algarroba | (noun) evergreen Mediterranean tree with edible pods; the biblical carob | Synonyms: carob, carob bean tree, carob tree, Ceratonia siliqua |
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| (noun) mesquite of Gulf Coast and Caribbean Islands from Mexico to Venezuela | Synonyms: Prosopis juliflora, Prosopis juliiflora |
| (noun) long pod containing small beans and sweetish edible pulp; used as animal feed and source of a chocolate substitute | Synonyms: algarroba bean, carob, carob bean, locust bean, locust pod |
| (noun) mesquite pod used in tanning and dyeing | Synonyms: algarobilla, algarrobilla |
| algarrobilla | (noun) mesquite pod used in tanning and dyeing | Synonyms: algarobilla, algarroba |
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| allegro | (noun) a musical composition or musical passage to be performed quickly in a brisk lively manner | - |
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| (noun) a brisk and lively tempo | - |
| allotrope | (noun) a structurally different form of an element | - |
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| allotropism | (noun) the phenomenon of an element existing in two or more physical forms | Synonyms: allotropy |
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| allotropy | (noun) the phenomenon of an element existing in two or more physical forms | Synonyms: allotropism |
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| alstroemeria | (noun) any of various South American plants of the genus Alstroemeria valued for their handsome umbels of beautiful flowers | - |
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