| NOUN | body | air cell, alveolus, air sac | a tiny sac for holding air in the lungs |
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| Meaning | A tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways. | |
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| Synonyms | alveolus, air sac | |
| Part of | lung | Either of two saclike respiratory organs in the chest of vertebrates |
| Broader | sac | A structure resembling a bag in an animal |
| Spanish | alveolo, alvéolo, alveolo pulmonar, alvéolo pulmonar | |
| Catalan | alvèol, alvèol pulmonar | |
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