Synonyms and Antonyms for air sac

1. air sac (n.)

any of the thin-walled extensions of the tracheae of insects


2. air sac (n.)

any of the membranous air-filled extensions of the lungs of birds

Synonyms: Antonyms:

3. air sac (n.)

a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways