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air sac
 
Noun air sac has 3 senses
  1. alveolus, air sac, air cell - a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
    --1 is a kind of sac
    --1 is a part of lung
  2. air sac - any of the thin-walled extensions of the tracheae of insects
    --2 is a kind of     sac
    --2 is a part of insect
  3. air sac - any of the membranous air-filled extensions of the lungs of birds
    --3 is a kind of     sac
    --3 is a part of bird
air pressure air pump air quality air rage air raid air reconnaissance air resistance air rifle air sac air search radar air shaft air show air sick air sickness air sleeve air sock air space

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