| aircrewman | (noun) a member of an aircrew | - |
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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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| airfare | (noun) the fare charged for traveling by airplane | - |
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| airfield | (noun) a place where planes take off and land | Synonyms: field, flying field, landing field |
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| airforce | (noun) the airborne branch of a country's armed forces | Synonyms: air force |
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| airframe | (noun) the framework and covering of an airplane or rocket (excluding the engines) | - |
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| airhead | (noun) a bridgehead seized by airborne troops | - |
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| (noun) a flighty scatterbrained simpleton | - |
| airiness | (noun) the property of something weightless and insubstantial | Synonyms: buoyancy |
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| (noun) the property of something spacious and abounding in fresh air | - |
| (noun) lightness in movement or manner | Synonyms: delicacy |
| airline | (noun) a commercial enterprise that provides scheduled flights for passengers | Synonyms: airline business, airway |
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| (noun) a hose that carries air under pressure | Synonyms: air hose |
| airliner | (noun) a commercial airplane that carries passengers | - |
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| airmailer | (noun) a mailer for airmail | - |
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| airplane | (noun) an aircraft that has a fixed wing and is powered by propellers or jets | Synonyms: aeroplane, plane |
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| airscrew | (noun) a propeller that rotates to push against air | Synonyms: airplane propeller, prop |
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| airsickness | (noun) motion sickness experienced while traveling by air (especially during turbulence) | Synonyms: air sickness |
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| airspace | (noun) the atmosphere above a nation that is deemed to be under its jurisdiction | - |
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| (noun) the space in the atmosphere immediately above the earth | Synonyms: air space |
| airspeed | (noun) the speed of an aircraft relative to the air in which it is flying | - |
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| airstream | (noun) a relatively well-defined prevailing wind | - |
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| (noun) the flow of air that is driven backwards by an aircraft propeller | Synonyms: backwash, race, slipstream, wash |
| airwave | (noun) medium for radio and television broadcasting | Synonyms: air |
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| airworthiness | (noun) fitness to fly | - |
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| aisle | (noun) passageway between seating areas as in an auditorium or passenger vehicle or between areas of shelves of goods as in stores | Synonyms: gangway |
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| (noun) part of a church divided laterally from the nave proper by rows of pillars or columns | - |
| (noun) a long narrow passage (as in a cave or woods) | - |
| aitchbone | (noun) a cut of beef including the H-shaped rump bone | - |
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| akaryocyte | (noun) a cell without a nucleus (as an erythrocyte) | Synonyms: acaryote, akaryote |
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| akaryote | (noun) a cell without a nucleus (as an erythrocyte) | Synonyms: acaryote, akaryocyte |
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| akee | (noun) red pear-shaped tropical fruit with poisonous seeds; flesh is poisonous when unripe or overripe | Synonyms: ackee |
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| (noun) widely cultivated in tropical and subtropical regions for its fragrant flowers and colorful fruits; introduced in Jamaica by William Bligh | Synonyms: akee tree, Blighia sapida |
| akinesia | (noun) motionlessness attributable to a temporary paralysis | Synonyms: akinesis |
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| akinesis | (noun) motionlessness attributable to a temporary paralysis | Synonyms: akinesia |
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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 |
| alanine | (noun) a crystalline amino acid that occurs in many proteins | - |
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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 | - |
| albedo | (noun) the ratio of reflected to incident light | Synonyms: reflective power |
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| albite | (noun) a widely distributed feldspar that forms rocks | Synonyms: white feldspar |
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| albuginea | (noun) whitish tunic | - |
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| 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 |
| 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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| alcahest | (noun) hypothetical universal solvent once sought by alchemists | Synonyms: alkahest, universal solvent |
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| alcalde | (noun) a mayor or chief magistrate of a Spanish town | - |
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| alchemist | (noun) one who was versed in the practice of alchemy and who sought an elixir of life and a panacea and an alkahest and the philosopher's stone | - |
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| alchemy | (noun) a pseudoscientific forerunner of chemistry in medieval times | - |
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| (noun) the way two individuals relate to each other | Synonyms: chemistry, interpersonal chemistry |
| alcove | (noun) a small recess opening off a larger room | Synonyms: bay |
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| aldehyde | (noun) any of a class of highly reactive chemical compounds; used in making resins and dyes and organic acids | - |
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| alder | (noun) north temperate shrubs or trees having toothed leaves and conelike fruit; bark is used in tanning and dyeing and the wood is rot-resistant | Synonyms: alder tree |
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| (noun) wood of any of various alder trees; resistant to underwater rot; used for bridges etc | - |
| alderfly | (noun) dark-colored insect having predaceous aquatic larvae | Synonyms: alder fly, Sialis lutaria |
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| alderman | (noun) a member of a municipal legislative body (as a city council) | - |
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| aldohexose | (noun) a monosaccharide sugar having six carbon atoms and an aldehyde group | - |
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| aldose | (noun) a monosaccharide sugar that contains the aldehyde group or is hemiacetal | - |
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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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| aldotriose | (noun) Any aldose having three carbon atoms; in reality, just glyceraldehyde. | - |
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| ale | (noun) a general name for beer made with a top fermenting yeast; in some of the United States an ale is (by law) a brew of more than 4% alcohol by volume | - |
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| alecost | (noun) tansy-scented Eurasian perennial herb with buttonlike yellow flowers; used as potherb or salad green and sometimes for potpourri or tea or flavoring; sometimes placed in genus Chrysanthemum | Synonyms: balsam herb, bible leaf, Chrysanthemum balsamita, costmary, mint geranium, Tanacetum balsamita |
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| alehoof | (noun) trailing European aromatic plant of the mint family having rounded leaves and small purplish flowers often grown in hanging baskets; naturalized in North America; sometimes placed in genus Nepeta | Synonyms: field balm, gill-over-the-ground, Glechoma hederaceae, ground ivy, Nepeta hederaceae, runaway robin |
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| alehouse | (noun) a tavern where ale is sold | - |
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| alembic | (noun) an obsolete kind of container used for distillation; two retorts connected by a tube | - |
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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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| aleph | (noun) the 1st letter of the Hebrew alphabet | - |
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| alert | (noun) a warning serves to make you more alert to danger | Synonyms: alerting |
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| (noun) an automatic signal (usually a sound) warning of danger | Synonyms: alarm, alarum, warning signal |
| (noun) condition of heightened watchfulness or preparation for action | Synonyms: qui vive |
| alerting | (noun) a warning serves to make you more alert to danger | Synonyms: alert |
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| (noun) a state of readiness to respond | Synonyms: alertness |
| alertness | (noun) lively attentiveness | Synonyms: on the qui vive, sharp-sightedness |
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| (noun) the process of paying close and continuous attention | Synonyms: vigilance, wakefulness, watchfulness |
| (noun) a state of readiness to respond | Synonyms: alerting |
| aleurone | (noun) granular protein in outermost layer of endosperm of many seeds or cereal grains | - |
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| alewife | (noun) shad-like food fish that runs rivers to spawn; often salted or smoked; sometimes placed in genus Pomolobus | Synonyms: Alosa pseudoharengus, Pomolobus pseudoharengus |
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| (noun) flesh of shad-like fish abundant along the Atlantic coast or in coastal streams | - |
| alexandrite | (noun) a green variety of chrysoberyl used as a gemstone | - |
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| alexia | (noun) inability to perceive written words | Synonyms: visual aphasia, word blindness |
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| alexic | (noun) a person with alexia | - |
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| alfileria | (noun) European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage | Synonyms: alfilaria, clocks, Erodium cicutarium, filaree, filaria, pin clover, pin grass, redstem storksbill |
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| algae | (noun) primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves | Synonyms: alga |
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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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| algometer | (noun) device for measuring pain caused by pressure | - |
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| algometry | (noun) measuring sensitivity to pain or pressure | - |
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| alidade | (noun) surveying instrument used with a plane table for drawing lines of sight on a distant object and for measuring angles | Synonyms: alidad |
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| (noun) surveying instrument consisting of the upper movable part of a theodolite including the telescope and its attachments | Synonyms: alidad |
| alien | (noun) a person who comes from a foreign country; someone who does not owe allegiance to your country | Synonyms: foreigner, noncitizen, outlander |
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| (noun) anyone who does not belong in the environment in which they are found | Synonyms: stranger, unknown |
| (noun) a form of life assumed to exist outside the Earth or its atmosphere | Synonyms: extraterrestrial, extraterrestrial being |
| alienage | (noun) the quality of being alien | Synonyms: alienism |
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| alienation | (noun) the action of alienating; the action of causing to become unfriendly | - |
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| (noun) (law) the voluntary and absolute transfer of title and possession of real property from one person to another | - |
| (noun) the feeling of being alienated from other people | Synonyms: disaffection, estrangement |
| (noun) separation resulting from hostility | Synonyms: estrangement |
| alienator | (noun) an unpleasant person who causes friendly people to become indifferent or unfriendly or hostile | - |
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| alienee | (noun) someone to whom the title of property is transferred | Synonyms: grantee |
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| alienism | (noun) the quality of being alien | Synonyms: alienage |
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| (noun) an obsolete term for the study and treatment of mental illness | - |
| alienist | (noun) a psychiatrist and specialist in the legal aspects of mental illness | - |
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| alienor | (noun) someone from whom the title of property is transferred | - |
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| alignment | (noun) the act of adjusting or aligning the parts of a device in relation to each other | - |
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| (noun) the spatial property possessed by an arrangement or position of things in a straight line or in parallel lines | - |
| (noun) (astronomy) apparent meeting or passing of two or more celestial bodies in the same degree of the zodiac | Synonyms: conjunction |
| (noun) an organization of people (or countries) involved in a pact or treaty | Synonyms: alinement, alliance, coalition |
| alikeness | (noun) similarity in appearance or character or nature between persons or things | Synonyms: likeness, similitude |
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| aliment | (noun) a source of materials to nourish the body | Synonyms: alimentation, nourishment, nutriment, nutrition, sustenance, victuals |
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| alimentation | (noun) the act of supplying food and nourishment | Synonyms: feeding |
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| (noun) a source of materials to nourish the body | Synonyms: aliment, nourishment, nutriment, nutrition, sustenance, victuals |
| alinement | (noun) an organization of people (or countries) involved in a pact or treaty | Synonyms: alignment, alliance, coalition |
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| aliterate | (noun) a person who can read but is disinclined to derive information from literary sources | Synonyms: aliterate person |
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| aliveness | (noun) the property of being animated; having animal life as distinguished from plant life | Synonyms: animateness, liveness |
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| (noun) the condition of living or the state of being alive | Synonyms: animation, life, living |
| alizarine | (noun) an orange-red crystalline compound used in making red pigments and in dyeing | Synonyms: alizarin |
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| alkahest | (noun) hypothetical universal solvent once sought by alchemists | Synonyms: alcahest, universal solvent |
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| alkalemia | (noun) a blood disorder characterized by a lower concentration of hydrogen ions in the blood (which rises above 7.45 on the pH scale) | - |
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| alkalimetry | (noun) volumetric analysis using standard solutions of alkali to measure the amount of acid present | - |
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| alkaliser | (noun) an agent that counteracts or neutralizes acidity (especially in the stomach) | Synonyms: alkalizer, antacid, antiacid, gastric antacid |
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| alkalizer | (noun) an agent that counteracts or neutralizes acidity (especially in the stomach) | Synonyms: alkaliser, antacid, antiacid, gastric antacid |
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| alkane | (noun) a series of non-aromatic saturated hydrocarbons with the general formula CnH(2n+2) | Synonyms: alkane series, methane series, paraffin, paraffin series |
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| alkanet | (noun) perennial or biennial herb cultivated for its delicate usually blue flowers | Synonyms: Anchusa officinalis, bugloss |
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| alkene | (noun) any unsaturated aliphatic hydrocarbon | Synonyms: olefin, olefine |
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| 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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| alkyne | (noun) a colorless flammable gas used chiefly in welding and in organic synthesis | Synonyms: acetylene, ethyne |
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| allayer | (noun) a person who reduces the intensity (e.g., of fears) and calms and pacifies | Synonyms: comforter, reliever |
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| allegation | (noun) (law) a formal accusation against somebody (often in a court of law) | - |
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| (noun) statements affirming or denying certain matters of fact that you are prepared to prove | Synonyms: allegement |