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Air sac   /ɛr sæk/   Listen
Air sac

noun
1.
A tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways.  Synonyms: air cell, alveolus.
2.
Any of the thin-walled extensions of the tracheae of insects.
3.
Any of the membranous air-filled extensions of the lungs of birds.






WordNet 3.0 © 2010 Princeton University








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Words linked to "Air sac" :   insect, bird, sac, lung



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