| 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 mattress |
a mattress filled with air, used esp. for camping, mobile living, or as an extra bed for visitors. |
| 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. |