Dictionary

air sac

noun

Definition of AIR SAC

1
:  one of the air-filled spaces in the body of a bird connected with the air passages of the lungs
2
:  alveolus 1b
3
:  a thin-walled dilation of a trachea occurring in many insects
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First Known Use of AIR SAC

circa 1805
AIR SAC Defined for Kids

air sac

noun

Definition of AIR SAC for Kids

:  one of the small pouches in the lungs where oxygen and carbon dioxide are exchanged
Medical Dictionary

air sac

noun

Medical Definition of AIR SAC

:  alveolus b

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