AIR SAC

• (noun) any of the membranous air-filled extensions of the lungs of birds

• (noun) any of the thin-walled extensions of the tracheae of insects

• (noun) a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

  synonyms : air cell , alveolus

WordNet® 3.0, © 2006 by Princeton University.

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