| airframe | (noun) the framework and covering of an airplane or rocket (excluding the engines) | - |
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| airfreight | (verb) transport (cargo) by air | Synonyms: air-freight, air-ship |
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| airgun | (noun) a gun that propels a projectile by compressed air | Synonyms: air gun, air rifle |
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| airhead | (noun) a bridgehead seized by airborne troops | - |
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| (noun) a flighty scatterbrained simpleton | - |
| airheaded | (adjective) lacking seriousness; given to frivolity | Synonyms: dizzy, empty-headed, featherbrained, giddy, light-headed, lightheaded, silly |
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| airily | (adverb) in a flippant manner | Synonyms: flippantly |
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| 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 |
| airing | (noun) the act of supplying fresh air and getting rid of foul air | Synonyms: ventilation |
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| (noun) a short excursion (a walk or ride) in the open air | - |
| (noun) the opening of a subject to widespread discussion and debate | Synonyms: dissemination, public exposure, spreading |
| airless | (adjective) lacking fresh air | Synonyms: close, stuffy, unaired |
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| airlift | (noun) transportation of people or goods by air (especially when other means of access are unavailable) | Synonyms: lift |
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| (verb) fly people or goods to or from places not accessible by other means | Synonyms: lift |
| airlike | (adjective) resembling air or having the form of air | Synonyms: aeriform |
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| 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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| airlock | (noun) a chamber that provides access to space where air is under pressure | Synonyms: air lock |
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| airmail | (noun) a system of conveying mail by aircraft | Synonyms: airpost |
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| (noun) letters and packages that are transported by aircraft | - |
| (verb) send or transport by airmail | - |
| airmailer | (noun) a mailer for airmail | - |
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| airman | (noun) a male who operates an aircraft | - |
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| airmanship | (noun) the art of operating aircraft | Synonyms: aviation |
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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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| airport | (noun) an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo | Synonyms: aerodrome, airdrome, drome |
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| airpost | (noun) a system of conveying mail by aircraft | Synonyms: airmail |
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| airs | (noun) affected manners intended to impress others | Synonyms: pose |
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| airscrew | (noun) a propeller that rotates to push against air | Synonyms: airplane propeller, prop |
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| airship | (noun) a steerable self-propelled aircraft | Synonyms: dirigible |
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| airsick | (adjective) experiencing motion sickness | Synonyms: air sick, carsick, seasick |
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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 |
| airstrip | (noun) an airfield without normal airport facilities | Synonyms: flight strip, landing strip, strip |
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| airt | (verb) channel into a new direction | Synonyms: redirect |
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| airtight | (adjective) having no weak points | Synonyms: air-tight |
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| (adjective) not allowing air or gas to pass in or out | Synonyms: air-tight, gas-tight |
| airwave | (noun) medium for radio and television broadcasting | Synonyms: air |
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| airway | (noun) a commercial enterprise that provides scheduled flights for passengers | Synonyms: airline, airline business |
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| (noun) a duct that provides ventilation (as in mines) | Synonyms: air duct, air passage |
| (noun) the passages through which air enters and leaves the body | Synonyms: respiratory tract |
| (noun) a designated route followed by airplanes in flying from one airport to another | Synonyms: air lane, flight path, skyway |
| airwoman | (noun) a woman aviator | Synonyms: aviatress, aviatrix |
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| airworthiness | (noun) fitness to fly | - |
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| airworthy | (adjective) (of aircraft) fit to fly | - |
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| airy | (adjective) characterized by lightness and insubstantiality; as impalpable or intangible as air | Synonyms: aerial, aeriform, aery, ethereal |
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| (adjective) having little or no perceptible weight; so light as to resemble air | - |
| (adjective) not practical or realizable; speculative | Synonyms: impractical, Laputan, visionary, windy |
| (adjective) open to or abounding in fresh air | Synonyms: aired |
| 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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| ajar | (adjective) slightly open | - |
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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 |
| akimbo | (adjective) (used of arms and legs) bent outward with the joint away from the body | - |
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| (adverb) with hands on hips and elbows extending outward | - |
| akin | (adjective) related by blood | Synonyms: blood-related, cognate, consanguine, consanguineal, consanguineous, kin |
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| (adjective) similar in quality or character | Synonyms: kindred |
| 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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| akvavit | (noun) Scandinavian liquor usually flavored with caraway seeds | Synonyms: aquavit |
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| ala | (noun) a wing of an insect | - |
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| (noun) a flat wing-shaped process or winglike part of an organism | - |
| alabaster | (adjective) of or resembling alabaster | Synonyms: alabastrine |
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| (noun) a very light white | - |
| (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 |
| alabastrine | (adjective) of or resembling alabaster | Synonyms: alabaster |
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| alacritous | (adjective) quick and eager | - |
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| alacrity | (noun) liveliness and eagerness | Synonyms: briskness, smartness |
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| alalia | (noun) paralysis of the vocal cords resulting in an inability to speak | - |
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| alanine | (noun) a crystalline amino acid that occurs in many proteins | - |
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| alar | (adjective) of or relating to the axil | Synonyms: axillary |
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| (adjective) having or resembling wings | Synonyms: alary, aliform, wing-shaped |
| alarm | (noun) a device that signals the occurrence of some undesirable event | Synonyms: alarm system, warning device |
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| (noun) a clock that wakes a sleeper at some preset time | Synonyms: alarm clock |
| (noun) an automatic signal (usually a sound) warning of danger | Synonyms: alarum, alert, warning signal |
| (noun) fear resulting from the awareness of danger | Synonyms: consternation, dismay |
| (verb) warn or arouse to a sense of danger or call to a state of preparedness | Synonyms: alert |
| (verb) fill with apprehension or alarm; cause to be unpleasantly surprised | Synonyms: appal, appall, dismay, horrify |
| alarmed | (adjective) experiencing a sudden sense of danger | - |
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| alarming | (adjective) frightening because of an awareness of danger | - |
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| alarmingly | (adverb) in an alarming manner | - |
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| alarmism | (noun) needless warnings | - |
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| alarmist | (noun) a person who alarms others needlessly | - |
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| alarum | (noun) an automatic signal (usually a sound) warning of danger | Synonyms: alarm, alert, warning signal |
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| alary | (adjective) having or resembling wings | Synonyms: alar, aliform, wing-shaped |
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| alas | (adverb) by bad luck | Synonyms: regrettably, unfortunately, unluckily |
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| alastrim | (noun) a mild form of smallpox caused by a less virulent form of the virus | Synonyms: Cuban itch, Kaffir pox, milk pox, pseudosmallpox, pseudovariola, variola minor, West Indian smallpox, white pox |
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| alate | (adjective) (of seeds or insects) having winglike extensions | Synonyms: alated |
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| alated | (adjective) (of seeds or insects) having winglike extensions | Synonyms: alate |
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| 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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| albescent | (adjective) becoming or shading into white | - |
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| albinal | (adjective) of or pertaining to or affected by albinism | Synonyms: albinic, albinistic, albinotic |
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| albinic | (adjective) of or pertaining to or affected by albinism | Synonyms: albinal, albinistic, albinotic |
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| albinism | (noun) the congenital absence of pigmentation in the eyes and skin and hair | - |
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| albinistic | (adjective) of or pertaining to or affected by albinism | Synonyms: albinal, albinic, albinotic |
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| albino | (adjective) having albinism | - |
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| (noun) an animal with congenital albinism | - |
| (noun) a person with congenital albinism: white hair and milky skin; eyes are usually pink | - |
| albinotic | (adjective) of or pertaining to or affected by albinism | Synonyms: albinal, albinic, albinistic |
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| albite | (noun) a widely distributed feldspar that forms rocks | Synonyms: white feldspar |
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| albitic | (adjective) of or related to albite 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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| albuminous | (adjective) relating to or containing or resembling albumin | - |
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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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| albuminuric | (adjective) of or related to the state of albuminuria | - |
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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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| 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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| alcalescent | (adjective) tending to become alkaline; slightly alkaline | Synonyms: alkalescent |
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| alcapton | (noun) an acid formed as an intermediate product of the metabolism of tyrosine and phenylalanine | Synonyms: alkapton, homogentisic acid |
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| alcaptonuria | (noun) a rare recessive metabolic anomaly marked by ochronosis and the presence of alkapton in the urine | Synonyms: alkaptonuria |
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| alcazar | (noun) any of various Spanish fortresses or palaces built by the Moors | - |
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