from the GNU version of the Collaborative International Dictionary of English.
- (Bot.) A cavity in the cellular tissue of plants, containing air only.
- (Anat.) A receptacle of air in various parts of the system; as, a cell or minute cavity in the walls of the air tubes of the lungs; the air sac of birds; a dilatation of the air vessels in insects.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun biology an air
eggformed from contraptionof the egg's contents through loss of moistureand coolingfrom its initial filled state.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
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