| 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. |
| airproof |
not allowing air to pass or penetrate. [2 definitions] |
| air pump |
a pump for suctioning, compressing, or injecting air. |
| air quality |
the degree that the air in a particular environment contains pollution. |
| air rifle |
a rifle operated by compressed air, used to fire small pellets or the like. |
| air sac |
an air-filled space or cavity in a living organism, esp. any of the ends of certain bronchial tubes in a bird's body that connect with the larger body cavity and assist in breathing. |
| air shaft |
a narrow vertical passage through which fresh air can reach an otherwise enclosed area such as the interior of a building; ventilating shaft. |
| airship |
a lighter-than-air aircraft, with its own propulsion system and steering control. |
| airsick |
nauseated because of air travel; suffering from airsickness. |
| airsickness |
motion sickness, usu. including nausea, caused by air travel. |
| airspeed |
the speed of a flying object, esp. an aircraft, relative to the surrounding air. |
| airstrike |
an attack by air forces or other military aviation against a ground or naval target. |
| airtight |
preventing the entrance or exit of air. [1/2 definitions] |
| air traffic |
movement of airplanes and other air transportation vehicles through the air or on runways. |
| air well |
a usu. central court that is enclosed by the exterior walls of a building and provides air and light. |
| airy |
open to the flow of air; breezy. [1/5 definitions] |
| alfresco |
in the open air; outdoors. [1/2 definitions] |
| all clear |
the signal that an air raid or disaster drill is over. |
| alveolar |
of or pertaining to small cavities such as the terminal air sacs of the lungs or the cells of a honeycomb. [1/4 definitions] |