English dictionary

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English noun: air sac

1. air sac (body) a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

Synonymsair cell, alveolus

Broader (hypernym)sac

Part meronymlung

2. air sac (animal) any of the thin-walled extensions of the tracheae of insects

Broader (hypernym)sac

Part meronyminsect

3. air sac (animal) any of the membranous air-filled extensions of the lungs of birds

Broader (hypernym)sac

Part meronymbird

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