air sac


Definition: Meaning of, air sac in English to English dictionary.

Pronunciation: / ɛː sak /

  • noun
  • synonym
  • antonym
Word Forms:
Singular Plural
air sac air sacs
  1. a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
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  2. any of the thin-walled extensions of the tracheae of insects
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  3. any of the membranous air-filled extensions of the lungs of birds
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antonym