Synonyms and Antonyms for air sac

1. air sac (n.)

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

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2. air sac (n.)

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

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3. air sac (n.)

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

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