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Open English Wordnet
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Nouns
(n)
alveolus
,
air sac
,
air cell
a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
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(n)
air sac
any of the thin-walled extensions of the tracheae of insects
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(n)
air sac
any of the membranous air-filled extensions of the lungs of birds
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