Synonyms for air-sac
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- 1. alveolus, air sac, air cell, sac
- usage: a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
- 2. air sac, sac
- usage: any of the thin-walled extensions of the tracheae of insects
- 3. air sac, sac
- usage: any of the membranous air-filled extensions of the lungs of birds