Definitions of air sac
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a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
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any of the membranous air-filled extensions of the lungs of birds
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type of:
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sac
a structure resembling a bag in an animal
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sac
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any of the thin-walled extensions of the tracheae of insects
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type of:
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sac
a structure resembling a bag in an animal
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sac
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