- 1. 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. Source: opted
- 2. n. a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways Source: wordnet
- 3. n. any of the thin-walled extensions of the tracheae of insects Source: wordnet
- 4. n. any of the membranous air-filled extensions of the lungs of birds Source: wordnet
- 5. 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. Source: webster
- 6. One of the spaces in different parts. of the bodies of birds,which are filled with air and connected with the air passages of thelungs; an air cell. Source: adambom
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air sac
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airbirdslungsbodiescellconnecteddifferentfilledpartspassagesspacesextensionstinyair-filleddilationformedholdinginsectsmembranouspassagewayssacterminaltracheae