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air sac meaning and definition

Definition and meaning of air sac at MeaningMonkey.org. air sac meaning and definition in the English Dictionary.

AIR SAC noun

Definition of air sac (noun)

  1. a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
  2. any of the thin-walled extensions of the tracheae of insects
  3. any of the membranous air-filled extensions of the lungs of birds
Source: Princeton University Wordnet
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