| 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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| 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 |
| affability | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affableness, amiability, amiableness, bonhomie, geniality |
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| affableness | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, amiability, amiableness, bonhomie, geniality |
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| afibrinogenemia | (noun) the absence of fibrinogen in the plasma leading to prolonged bleeding | - |
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| afterbirth | (noun) the placenta and fetal membranes that are expelled from the uterus after the baby is born | - |
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| afterburner | (noun) a device that injects fuel into a hot exhaust for extra thrust | - |
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| agammaglobulinemia | (noun) a rare immunological disorder characterized by the virtual absence of gamma globulin in the blood and consequent susceptibility to infection | - |
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| agoraphobia | (noun) a morbid fear of open spaces (as fear of being caught alone in some public place) | - |
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| agreeability | (noun) a temperamental disposition to be agreeable | Synonyms: agreeableness |
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| agreeableness | (noun) a temperamental disposition to be agreeable | Synonyms: agreeability |
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| (noun) pleasantness resulting from agreeable conditions | Synonyms: amenity |
| agribusiness | (noun) a large-scale farming enterprise | Synonyms: agriculture, factory farm |
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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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| ailurophobia | (noun) a morbid fear of cats | - |
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| airbrake | (noun) a vehicular brake that operates by compressed air; especially for heavy vehicles | - |
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| (noun) a small parachute or articulated flap to reduce the speed of an aircraft | Synonyms: dive brake |
| airbrush | (noun) an atomizer to spray paint by means of compressed air | - |
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| airburst | (noun) an explosion in the atmosphere | - |
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| airbus | (noun) a subsonic jet airliner operated over short distances | - |
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| aitchbone | (noun) a cut of beef including the H-shaped rump bone | - |
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| alabaster | (noun) a very light white | - |
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| (noun) a compact fine-textured, usually white gypsum used for carving | - |
| (noun) a hard compact kind of calcite | Synonyms: Mexican onyx, onyx marble, oriental alabaster |
| alb | (noun) a white linen liturgical vestment with sleeves; worn by priests | - |
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| albacore | (noun) large pelagic tuna the source of most canned tuna; reaches 93 pounds and has long pectoral fins; found worldwide in tropical and temperate waters | Synonyms: long-fin tunny, Thunnus alalunga |
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| (noun) relatively small tuna with choice white flesh; major source of canned tuna | - |
| 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 |
| albedo | (noun) the ratio of reflected to incident light | Synonyms: reflective power |
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| albinism | (noun) the congenital absence of pigmentation in the eyes and skin and hair | - |
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| albino | (noun) an animal with congenital albinism | - |
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| (noun) a person with congenital albinism: white hair and milky skin; eyes are usually pink | - |
| albite | (noun) a widely distributed feldspar that forms rocks | Synonyms: white feldspar |
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| albizia | (noun) any of numerous trees of the genus Albizia | Synonyms: albizzia |
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| albizzia | (noun) any of numerous trees of the genus Albizia | Synonyms: albizia |
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| albuca | (noun) any of various plants of the genus Albuca having large clusters of pale yellow flowers; South Africa | - |
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| albuginea | (noun) whitish tunic | - |
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| album | (noun) a book of blank pages with pockets or envelopes; for organizing photographs or stamp collections etc | - |
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| (noun) one or more recordings issued together; originally released on 12-inch phonograph records (usually with attractive record covers) and later on cassette audiotape and compact disc | Synonyms: record album |
| albumen | (noun) the white part of an egg; the nutritive and protective gelatinous substance surrounding the yolk consisting mainly of albumin dissolved in water | Synonyms: egg white, ovalbumin, white |
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| (noun) a simple water-soluble protein found in many animal tissues and liquids | Synonyms: albumin |
| albumin | (noun) a simple water-soluble protein found in many animal tissues and liquids | Synonyms: albumen |
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| albuminoid | (noun) a simple protein found in horny and cartilaginous tissues and in the lens of the eye | Synonyms: scleroprotein |
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| albuminuria | (noun) the presence of excessive protein (chiefly albumin but also globulin) in the urine; usually a symptom of kidney disorder | Synonyms: proteinuria |
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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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| alembic | (noun) an obsolete kind of container used for distillation; two retorts connected by a tube | - |
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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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| algebra | (noun) the mathematics of generalized arithmetical operations | - |
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| algebraist | (noun) a mathematician whose specialty is algebra | - |
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| algophobia | (noun) a morbid fear of pain | - |
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| alibi | (noun) (law) a defense by an accused person purporting to show that he or she could not have committed the crime in question | - |
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| (noun) a defense of some offensive behavior or some failure to keep a promise etc. | Synonyms: exculpation, excuse, self-justification |
| alkylbenzene | (noun) organic compound that has an alkyl group bound to a benzene ring | - |
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| alkylbenzenesulfonate | (noun) sulfonate of alkyl benzene | - |
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| alloantibody | (noun) an antibody that occurs naturally against foreign tissues from a person of the same species | Synonyms: isoantibody |
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| alphabet | (noun) the elementary stages of any subject (usually plural) | Synonyms: first principles, rudiments |
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| (noun) a character set that includes letters and is used to write a language | Synonyms: ABC's, ABC, ABCs |
| alphabetisation | (noun) the act of putting in alphabetical order | Synonyms: alphabetization |
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| alphabetiser | (noun) a literate person who can arrange items in alphabetical order | Synonyms: alphabetizer |
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| alphabetization | (noun) the act of putting in alphabetical order | Synonyms: alphabetisation |
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| alphabetizer | (noun) a literate person who can arrange items in alphabetical order | Synonyms: alphabetiser |
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| alterability | (noun) the quality of being alterable | - |
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| alumbloom | (noun) any of several herbs of the genus Heuchera | Synonyms: alumroot |
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| ambage | (noun) a style that involves indirect ways of expressing things | Synonyms: circumlocution, periphrasis |
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| ambages | (noun) (archaic) roundabout or mysterious ways of action | - |
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| ambassador | (noun) a diplomat of the highest rank; accredited as representative from one country to another | Synonyms: embassador |
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| (noun) an informal representative | - |
| ambassadorship | (noun) the post of ambassador | - |
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| ambassadress | (noun) a woman ambassador | - |
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| amber | (noun) a deep yellow color | Synonyms: gold |
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| (noun) a hard yellowish to brownish translucent fossil resin; used for jewelry | - |
| amberbell | (noun) eastern North American dogtooth having solitary yellow flowers marked with brown or purple and spotted interiors | Synonyms: Erythronium americanum, trout lily, yellow adder's tongue |
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| amberfish | (noun) any of several amber to coppery fork-tailed warm-water carangid fishes | Synonyms: amberjack |
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| ambergris | (noun) waxy substance secreted by the sperm whale and found floating at sea or washed ashore; used in perfume | - |
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| amberjack | (noun) any of several amber to coppery fork-tailed warm-water carangid fishes | Synonyms: amberfish |
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| ambiance | (noun) the atmosphere of an environment | Synonyms: ambience |
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| (noun) a particular environment or surrounding influence | Synonyms: ambience, atmosphere |
| ambidexterity | (noun) the property of being equally skillful with each hand | Synonyms: ambidextrousness |
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| ambidextrousness | (noun) the property of being equally skillful with each hand | Synonyms: ambidexterity |
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| ambience | (noun) the atmosphere of an environment | Synonyms: ambiance |
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| (noun) a particular environment or surrounding influence | Synonyms: ambiance, atmosphere |
| ambiguity | (noun) unclearness by virtue of having more than one meaning | Synonyms: equivocalness |
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| (noun) an expression whose meaning cannot be determined from its context | - |
| ambit | (noun) an area in which something acts or operates or has power or control: | Synonyms: compass, orbit, range, reach, scope |
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| ambition | (noun) a strong drive for success | Synonyms: ambitiousness |
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| (noun) a cherished desire | Synonyms: aspiration, dream |
| ambitiousness | (noun) a strong drive for success | Synonyms: ambition |
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| ambivalence | (noun) mixed feelings or emotions | Synonyms: ambivalency |
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| ambivalency | (noun) mixed feelings or emotions | Synonyms: ambivalence |
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| ambiversion | (noun) (psychology) a balanced disposition intermediate between extroversion and introversion | - |
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| amble | (noun) a leisurely walk (usually in some public place) | Synonyms: perambulation, promenade, saunter, stroll |
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| ambler | (noun) someone who walks at a leisurely pace | Synonyms: saunterer, stroller |
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| amblygonite | (noun) a white or grey mineral consisting of lithium aluminum phosphate; a source of lithium | - |
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| amblyopia | (noun) visual impairment without apparent organic pathology | - |
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| ambo | (noun) a platform raised above the surrounding level to give prominence to the person on it | Synonyms: dais, podium, pulpit, rostrum, soapbox, stump |
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| amboceptor | (noun) an immune body formed in the blood during infection or immunization that serves to link the complement to the antigen. | - |
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| amboyna | (noun) tree native to southeastern Asia having reddish wood with a mottled or striped black grain | Synonyms: padauk, padouk, Pterocarpus indicus |
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| (noun) mottled curly-grained wood of Pterocarpus indicus | Synonyms: Andaman redwood |
| ambrosia | (noun) (classical mythology) the food and drink of the gods; mortals who ate it became immortal | Synonyms: nectar |
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| (noun) fruit dessert made of oranges and bananas with shredded coconut | - |
| (noun) any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma | Synonyms: bitterweed, ragweed |
| (noun) a mixture of nectar and pollen prepared by worker bees and fed to larvae | Synonyms: beebread |
| ambulacrum | (noun) one of the five areas on the undersurface of an echinoderm on which the tube feet are located | - |
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| ambulance | (noun) a vehicle that takes people to and from hospitals | - |
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| ambulation | (noun) walking about | - |
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| ambulatory | (noun) a covered walkway (as in a cloister) | - |
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| ambuscade | (noun) the act of concealing yourself and lying in wait to attack by surprise | Synonyms: ambush, lying in wait, trap |
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| ambush | (noun) the act of concealing yourself and lying in wait to attack by surprise | Synonyms: ambuscade, lying in wait, trap |
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| ambusher | (noun) an attacker who waits in a concealed position to launch a surprise attack | - |
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| ambystomid | (noun) small to moderate-sized terrestrial or semiaquatic New World salamander | Synonyms: ambystomid salamander |
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| ameba | (noun) naked freshwater or marine or parasitic protozoa that form temporary pseudopods for feeding and locomotion | Synonyms: amoeba |
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| amebiasis | (noun) infection by a disease-causing ameba | Synonyms: amebiosis, amoebiasis, amoebiosis |
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| amebiosis | (noun) infection by a disease-causing ameba | Synonyms: amebiasis, amoebiasis, amoebiosis |
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| ameloblast | (noun) a cell from which tooth enamel develops | - |
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| amenability | (noun) the trait of being cooperative | Synonyms: amenableness, cooperativeness |
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