VariousWords beta
Related Terms:
Definitions:
Noun
alveolus
air sac
air cell
Definition: a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
air sac
Definition: any of the thin-walled extensions of the tracheae of insects
air sac
Definition: any of the membranous air-filled extensions of the lungs of birds
Definition: An alveolus