Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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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.)
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.
air command a major unit in a military air force, esp. in the United States.
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 curtain a draft of compressed air blown continuously across a doorway, usu. downward, to act as a door in maintaining interior temperature.
air force the aviation branch of a nation's military forces, or one of the units under an air command.
air gun a gun that is operated by compressed air and usu. fires small pellets. [2 definitions]
air hole an opening for the intake or discharge of air or gas. [3 definitions]
air lane a route regularly used by aircraft; airway.
air letter an airmail letter. [2 definitions]
air lock an airtight compartment in which the air pressure can be regulated, usu. situated between two areas that have different air pressures, as in underwater operations. [2 definitions]
air mass a body of air that covers a wide area and has little horizontal variation in temperature, pressure, or moisture.
air one's dirty linen in public to make public embarrassing or shameful private facts about oneself or others.
air piracy the hijacking of an airplane, helicopter, or the like.
air pocket a downward air current that can cause an abrupt change, usu. a drop, in an aircraft's altitude.
air power a country's military capacity for waging war by air.
air pressure the pressure of compressed air, as in a tire or pump, or the pressure of the earth's atmosphere.