air sac

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• February 26. 2016 from wordnet.princeton.edu

  air sac — noun — english

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

• February 26. 2016 from wordnet.princeton.edu

  air sac — noun — english

  any of the thin-walled extensions of the tracheae of insects

• February 26. 2016 from wordnet.princeton.edu

  air sac — noun — english

  any of the membranous air-filled extensions of the lungs of birds