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Definitions for: Air Sac
[n] any of the membranous air-filled extensions of the lungs of birds
[n] any of the thin-walled extensions of the tracheae of insects
[n] a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
Webster (1913) Definition: Air" sac` (Anat.)
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.
Synonyms: air cell, alveolus
See Also: bird, insect, lung, sac, sac
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