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1. (n.) air sac
any of certain cavities in a bird's body connected with the lungs.
Etymology: (1820–30)
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| Definition of 'air sac' |
Princeton's WordNet |
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1. (noun) alveolus, air sac, air cell
a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
2. (noun) air sac
any of the thin-walled extensions of the tracheae of insects
3. (noun) air sac
any of the membranous air-filled extensions of the lungs of birds
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| Definition of 'air sac' |
Webster Dictionary |
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1. air sac
one of the spaces in different parts of the bodies of birds, which are filled with air and connected with the air passages of the lungs; an air cell
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Definitions of air sac 
