qì​náng

air sac

气囊 (氣囊) qì​náng
air sac noun
a thin-walled, air-filled cavity in the body of an animal or plant, especially in birds
gasbag noun
a flexible container filled with gas in an aerostat, or a safety airbag in a vehicle

Frequency

Movie subtitles
1.70 per million appears in 1% of films
Written text
3.95 per million

Sources

Definitions
CC-CEDICT