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

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air bag a bag in the front of some cars that blows up with air instantly in a crash to stop the passengers from being thrown 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 machine that cools the air in a room or car. An air conditioner also takes the dust and dampness out of the air.
air conditioning a system that cools air and takes dust and dampness out of it. Air conditioning is used inside buildings and cars.
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 branch of a nation's armed forces that trains and fights using aircraft.
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 force of air on things. Air pressure has to do with how much force air has when it has been compressed into a space like a tire. It is also the pressure of the earth's atmosphere.