air sac

noun

Definition of AIR SAC

: one of the air-filled spaces in the body of a bird connected with the air passages of the lungs

: alveolus 1b

: a thin-walled dilation of a trachea occurring in many insects

See air sac defined for kids

circa 1805

AIR SAC Defined for Kids

noun

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

Medical Dictionary

noun

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