air sac

Definitions of air sac
1

n a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

Synonyms:
air cell, alveolus
Type of:
sac
a structure resembling a bag in an animal

n any of the membranous air-filled extensions of the lungs of birds

Type of:
sac
a structure resembling a bag in an animal

n any of the thin-walled extensions of the tracheae of insects

Type of:
sac
a structure resembling a bag in an animal

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