| NOUN | body | air sac, alveolus, air cell | a tiny sac for holding air in the lungs |
|---|---|---|---|
| animal | air sac | any of the thin-walled extensions of the tracheae of insects | |
| animal | air sac | any of the membranous air-filled extensions of the lungs of birds |
| Meaning | A tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways. | |
|---|---|---|
| Synonyms | alveolus, air cell | |
| 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 | |
| Meaning | Any of the thin-walled extensions of the tracheae of insects. | |
|---|---|---|
| Part of | insect | small air-breathing arthropod |
| Broader | sac | A structure resembling a bag in an animal |
| Meaning | Any of the membranous air-filled extensions of the lungs of birds. | |
|---|---|---|
| Part of | bird | warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings |
| Broader | sac | A structure resembling a bag in an animal |
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