a. [ Gr. &unr_; spine + &unr_; wing. ] 1. (Zool.) Spiny-winged. [ 1913 Webster ]

2. (Zool.) Acanthopterygious. [ 1913 Webster ]

n. [ Accelerate + -graph. ] (Mil.) An apparatus for studying the combustion of powder in guns, etc. [ 1913 Webster ]

n. [ Accelerate + -meter. ] An apparatus for measuring the velocity imparted by gunpowder. [ 1913 Webster ]

a. [ (a) L. acerosus chaffy, fr. acus, gen. aceris, chaff; (b) as if fr. L. acus needle: cf. F. acéreux. ] (Bot.) (a) Having the nature of chaff; chaffy. (b) Needle-shaped, having a sharp, rigid point, as the leaf of the pine. [ 1913 Webster ]

a. Same as Acerose. [ 1913 Webster ]

a. [ Gr. α priv. + ke`ras a horn. ] (Zool.) (a) Destitute of tentacles, as certain mollusks. (b) Without antennæ, as some insects. [ 1913 Webster ]

a. [ L. acetablum a little cup + -ferous. ] Furnished with fleshy cups for adhering to bodies, as cuttlefish, etc. [ 1913 Webster ]

n. [ L., fr. Gr. &unr_;. ] (Myth.) A river in the Nether World or infernal regions; also, the infernal regions themselves. By some of the English poets it was supposed to be a flaming lake or gulf. Shak. [ 1913 Webster ]

n. 1. 1 death's-head moth.
Syn. -- genus Acherontia [ WordNet 1.5 ]

a. Of or pertaining to Acheron; infernal; hence, dismal, gloomy; moribund. [ 1913 Webster ]

a. [ L. acidus sour + -ferous. ] Containing or yielding an acid. [ 1913 Webster ]

‖n. [ NL.; adeno- + sclerosis. ] (Med.) The hardening of a gland. AS [ Webster 1913 Suppl. ]

a. Like adipocere. [ 1913 Webster ]

n. 1. a steroid having androgenic activity; obtained from the cortex of the adrenal gland. [ WordNet 1.5 ]

a. 1. Guilty of, or given to, adultery; pertaining to adultery; illicit. Dryden. [ 1913 Webster ]

2. Characterized by adulteration; spurious. “An adulterous mixture.” [ Obs. ] Smollett. [ 1913 Webster ]

adv. In an adulterous manner. [ 1913 Webster ]

n. 1. 1 African antelopes: impalas.
Syn. -- genus Aepyceros [ WordNet 1.5 ]

adj. of or pertaining to aeronautics or aircraft. [ PJC ]

n. [ See aerobies. ] an organism such as a microorganism that requires oxygen for life or growth. [ PJC ]

n. pl., but sing. or pl. in usage 1. physical exercises performed in a sustained and strenuous fashion designed to cause a temporary increase in respiration rate and heart rate, such a running, swimming, walking, or calisthenics. Calisthenic sessions in groups, performed by following a leader in moving to a rhythmic musical accompaniment, are a popular form of aerobics. [ PJC. ]

2. a system of physical conditioning relying largely on aerobics exercises. [ PJC. ]

n. 1. the resistance caused by a gas to the motion of a solid body moving through it. Studied in aerodynamics. [ PJC ]

n. [ Aëro- + dynamics: cf. F. aérodynamique. ] The science which treats of the air and other gaseous bodies under the action of force, and of their mechanical effects. [ 1913 Webster ]

n. [ Aëro- + Gr. &unr_; . ] (Aëronautics) a heavier-than-air aircraft; same as aeroplane. Contrasted with aerostat. [ PJC ]

n. [ Aëro- + foil. ] A plane or arched surface for sustaining bodies by its movement through the air; a spread wing, as of a bird. [ Webster 1913 Suppl. ]

n. [ Aëro- + Gr. &unr_; knowing, knowledge: cf. F. aérognosie. ] The science which treats of the properties of the air, and of the part it plays in nature. Craig. [ 1913 Webster ]

n. One versed in aëography: an aërologist. [ 1913 Webster ]

{ } a. Pertaining to aërography; aërological. [ 1913 Webster ]

n. [ Aëro- + -graphy: cf. F. aérographie. ] A description of the air or atmosphere; aërology. [ 1913 Webster ]

n. [ Aëro- + gun. ] A cannon capable of being trained at very high angles for use against aircraft. Now usually referred to an anitaircraft cannon. [ Webster 1913 Suppl. +PJC ]

a. [ Aëro- + hydrodynamic. ] Acting by the force of air and water; as, an aërohydrodynamic wheel. [ 1913 Webster ]

n. [ Aëro- + -lite: cf. F. aérolithe. ] (Meteor.) A stone, or metallic mass, which has fallen to the earth from distant space; a meteorite; a meteoric stone. [ 1913 Webster ]

☞ Some writers limit the word to stony meteorites. [ 1913 Webster ]

n. Same as Aërolite. [ 1913 Webster ]

n. [ Aëro- + lithology. ] The science of aërolites. [ 1913 Webster ]

a. Of or pertaining to aërolites; meteoric; as, aërolitic iron. Booth. [ 1913 Webster ]

{ } a. Of or pertaining to aërology. [ 1913 Webster ]

n. One versed in aërology. [ 1913 Webster ]

n. [ Aëro- + -logy: cf. F. aérologie. ] That department of physics which treats of the atmosphere. [ 1913 Webster ]

n. [ Aëro- + -mancy: cf. F. aéromancie. ] Divination from the state of the air or from atmospheric substances; also, forecasting changes in the weather. [ 1913 Webster ]

n. A mechanic or mechanician expert in the art and practice of aëronautics. [ Webster 1913 Suppl. ]

{ , a. Of or pert. to aëromechanics. [ Webster 1913 Suppl. ]

n. The science of equilibrium and motion of air or an aëriform fluid, including aërodynamics and aërostatics. [ Webster 1913 Suppl. ]

n. [ Aëro- + -meter: cf. F. éromètre. ] An instrument for ascertaining the weight or density of air and gases. [ 1913 Webster ]

a. Of or pertaining to aërometry; as, aërometric investigations. [ 1913 Webster ]

n. [ Aëro- + -metry: cf. F. érométrie. ] The science of measuring the air, including the doctrine of its pressure, elasticity, rarefaction, and condensation; pneumatics. [ 1913 Webster ]

n. [ F. aéronat. See Aëro-; Natation. ] A dirigible balloon. [ obsolescent ] [ Webster 1913 Suppl. +PJC ]

n. [ F. aéronaute, fr. Gr. &unr_; air + &unr_; sailor. See Nautical. ] An aërial navigator; a balloonist. [ 1913 Webster ]

{ } a. [ Cf. F. aéronauitique. ] Pertaining to aëronautics, or aërial sailing. [ 1913 Webster ]

n. The science or art of ascending and sailing in the air, as by means of a balloon; aërial navigation; ballooning. [ 1913 Webster ]

n. [ F. aéronef. ] A power-driven, heavier-than-air flying machine. Now called airplane. [ obsolescent ] [ Webster 1913 Suppl. +PJC ]

{ ‖ } n. [ Aero- + Gr. fo`bos fear: cf. F. aérophobie. ] (Med.) Dread of a current of air or of fresh air. [ 1913 Webster + AS ]