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air sac

air sac

air sac - Dictionary definition and meaning for word air sac

Definition
(noun) a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
Synonyms : air cell , alveolus

Definition
(noun) any of the thin-walled extensions of the tracheae of insects
Definition
(noun) any of the membranous air-filled extensions of the lungs of birds

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