the rooms in different areas of the systems of wild birds which are filled up with environment and related to the air passages associated with lungs an air cellular
- a little sac for holding air in the lungs; formed by the terminal dilation of small air passageways
- any of the membranous air-filled extensions of the lung area of birds
- some of the thin-walled extensions for the tracheae of pests
- one of several rooms in numerous components of the figures of birds, that are filled up with atmosphere and related to air passages of lungs; an atmosphere cell.
one of many rooms in different areas of the bodies of wild birds, that are full of air and related to air passages of this lungs; an air cell.