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aigrette a head ornament made of an upright tuft of egret tail feathers.
aikido a system of self-defense, originating in Japan, in which an opponent's strength and weight are used against him or her by using specific throws and holds.
ail to distress or cause illness or discomfort to. [2 definitions]
ailanthus a deciduous tree, originating in Asia, with fernlike leaves and clusters of greenish flowers with an offensive odor.
aileron a movable flap on the rear edge of an airplane's wing, used to control rolling and banking.
ailing in poor or weakened health or condition; sickly or sick.
ailment a sickness or disorder, usu. physical; illness.
aim to point carefully (usu. a weapon), with the intention of hitting a target. [8 definitions]
aimless characterized by or having no purpose.
ain't (informal) contracted form of "am not," "is not," "are not," "have not," or "has not."
Ainu a member of an aboriginal people native to the northernmost islands of Japan, noted for their ample body hair. [3 definitions]
air the tasteless, odorless, and colorless mixture of nitrogen, oxygen, and other gases that forms the earth's atmosphere. [8 definitions]
air bag a bag in the front of some automobile interiors that inflates automatically in a collision and prevents the passengers from being thrust forward.
air base a military base for air force operations.
air bladder an air-filled sac in various animals and plants, esp. such a structure located near the spine of certain fish that functions to maintain buoyancy by regulating hydrostatic pressure. (See swim bladder.)
airborne borne or carried in the air. [2 definitions]
airbrake a brake or brake system operated by the force of compressed air against a piston.
airbrush an atomizer used to apply liquid, usu. paint, in a fine spray.
airburst an explosion of a bomb or shell before it touches the ground.
air chamber a compartment in which air is confined for a special use, as in a pump, a hydraulic fluid regulator, or a living organism.
aircheck a recording of a radio broadcast, esp. of music.