air sac

noun
|Updated on: 28 Apr 2018

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

Recent Examples of air sac from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'air sac.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of air sac

circa 1805

in the meaning defined at sense 1

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AIR SAC Defined for Kids

air sac

noun

Definition of air sac for Students

: 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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