1. Unclassified
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. Noun
any of the membranous air-filled extensions of the lungs of birds
Vocabulary classified under Medicine and healthcare
3. Noun
any of the thin-walled extensions of the tracheae of insects
Vocabulary classified under Medicine and healthcare
4. Noun
a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
Vocabulary classified under Medicine and healthcare
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