A jacket with airtight cells, or cavities which can be filled with air, to make the wearer buoyant when swimming.

plural of air jacket

An extensive cascade of ionized particles formed by the entry of a cosmic ray into the atmosphere

(of a missile) fired from a an aircraft in flight to a ship

(of a missile) fired from a ship at an aircraft in flight, or at an incoming missile

The (volume of) air that is inhaled and exhaled with each resting breath

plural of air freshener

(Australia, informal) Any of the correspondence schools catering for the primary and early secondary education of children in remote and outback Australia.

(computer security, of a system) Physically isolated from the Internet or some other unsecured network.

Synonym of windsock