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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]
aioli a rich sauce, similar to mayonnaise, made of crushed garlic, egg yolks, lemon juice, and olive oil, served with vegetables, fish, and seafood.
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.
air conditioner a device that circulates cooled and dehumidified air in a building, car, or other space.
air conditioning a system that circulates cooled and dehumidified air in a building, car, or other space.
air-cooled cooled by circulating air, as an engine. [2 definitions]