air vessel
/ˈɛː ˌvɛsl/noun
1A receptacle or structure containing air; especially an air chamber in a hydraulic pump.
2 Biology. A cavity, sac, or channel in a living organism which contains air; especially a trachea or respiratory tube in an insect; an air-filled bladder in an alga.
3An aircraft.
Origin
Late 17th century; earliest use found in Henry Oldenburg (c1619–1677), scientific correspondent and secretary of the Royal Society. From air + vessel.