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Search Result for "air sac":
Wordnet 3.0

NOUN (3)

1. a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways;
[syn: alveolus, air sac, air cell]

2. any of the thin-walled extensions of the tracheae of insects;

3. any of the membranous air-filled extensions of the lungs of birds;


The Collaborative International Dictionary of English v.0.48:

Air sac \Air" sac`\ 1. (Anat.) One of the spaces in different parts of the bodies of birds, which are filled with air and connected with the air passages of the lungs; an air cell. [1913 Webster] 2. An alveolus. [PJC]
WordNet (r) 3.0 (2006):

air sac n 1: a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways [syn: alveolus, air sac, air cell] 2: any of the thin-walled extensions of the tracheae of insects 3: any of the membranous air-filled extensions of the lungs of birds