noun
Biological term for air-filled sacs in birds, insects, and other organisms.
鳥の気嚢は呼吸を助ける。
Birds' air sacs aid respiration.
noun
gasbag; envelope
Refers to the gas-containing compartment of an airship or balloon.
飛行船の気嚢にはヘリウムが詰められている。
The airship's gasbag is filled with helium.
Compound of 気 (ki, 'air, gas') and 嚢 (nō, 'sac, bag'). The kanji 嚢 is relatively rare and often replaced by kana in modern writing.