AIR SAC Definition & Meaning

air sac

noun

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

air sac

noun

any of the membranous air-filled extensions of the lungs of birds, which increase the efficiency of gaseous exchange in the lungs
any of the thin-walled extensions of the tracheae of insects having a similar function

air sac

An air-filled space in the body of a bird that forms a connection between the lungs and bone cavities and aids in breathing and temperature regulation.
See alveolus
A saclike enlargement in the trachea of an insect.
A baglike piece of skin or tissue below the jaw of certain animals, such as the bullfrog and orangutan, that can be inflated to increase sound production.

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�y��vlog History and Origins

Origin of air sac¹

First recorded in 1820–30

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Example Sentences

Examples have not been reviewed.

A micro CT scan - that produces 3D images - revealed the contents of the egg, complete with the air sac.

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The study also found that the children are missing half of their alveolar macrophages, which are located in the air sacs of the lungs.

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Conversely, epithelial cells, which line the air sacs of the lungs and are the precursors to lung adenocarcinomas, grow excessively in response to mutated EGFR.

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They drew inspiration from the architecture of the human lungs, which contain spherical "air sacs" called alveoli that enable a high interaction rate with blood within a short time.

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Within the lungs, oxygen is absorbed and carbon dioxide released via air sacs called alveoli.

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