Main Entry: lung

Pronunciation: \ˈləŋ\

Function: noun

Etymology: Middle English lunge, from Old English lungen; akin to Old High German lungun lung, līhti light in weight — more at light

Date: before 12th century

1 a : one of the usually paired compound saccular thoracic organs that constitute the basic respiratory organ of air-breathing vertebrates b : any of various respiratory organs of invertebrates
2 a : a device enabling individuals abandoning a submarine to rise to the surface b : a mechanical device for regularly introducing fresh air into and withdrawing stale air from the lung : respirator — compare iron lung

— lung·ful \-ˌfu̇l\ noun