Air Sac — synonyms, definition

1. air sac (Noun)

2 synonyms
air cell alveolus
3 definitions

air sac (Noun) — A tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways.

air sac (Noun) — Any of the thin-walled extensions of the tracheae of insects.

air sac (Noun) — Any of the membranous air-filled extensions of the lungs of birds.

1 type of
sac
3 parts of
bird insect lung