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Air sac

noun

Definitions

Noun
  1. 1
    An alveolus.
  2. 2
    any of the membranous air-filled extensions of the lungs of birds wordnet
  3. 3
    An extension of a lung of some birds.
  4. 4
    any of the thin-walled extensions of the tracheae of insects wordnet
  5. 5
    a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways wordnet

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