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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.
air command a major unit in a military air force, esp. in the United States.
air-condition to furnish with air conditioning.