Definition of air sac
English to English noun - a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
source: WordNet 3.0 - any of the thin-walled extensions of the tracheae of insects
source: WordNet 3.0 - any of the membranous air-filled extensions of the lungs of birds
source: WordNet 3.0
Visual Synonyms 
Nearby Word
air sac, air sock, air sick, airs, airsick, air gas, air hose, arace, arauca, arrack, arrach, arc, arachis, araceae, arch, aras, arak, arco, ares, arca
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