air' sac"

1. a sac containing air.
2. alveolus (def. 2).
3. any of certain cavities in a bird's body connected with the lungs.
4. a saclike dilation of the wall of a trachea in many insects.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

air routeair scoop
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