air sac
NounOpen English WordNet
Noun (3)
- a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passagewaysSynonyms: alveolusair cellType of sacPart of lung
- any of the thin-walled extensions of the tracheae of insectsType of sacPart of insect
- any of the membranous air-filled extensions of the lungs of birdsType of sacPart of bird
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Webster's Dictionary (1913)
Air′ sac′ (…).
1. Anatomy 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.
2. An alveolus.
Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54 · with additions: GCIDE editors