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air sac
noun
- a sac containing air.
- 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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Word History and Origins
Origin of air sac1
First recorded in 1820–30
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Example Sentences
But the joints of the backbone in front of the sacrum receive their air from the cervical air sac.
From Project Gutenberg
These animals are said to possess an air-sac in the throat, at the back of the trachea (or windpipe), as in Ateles.
From Project Gutenberg
The cheek-bones enormously swollen along the side of the nose; in the neck a large air-sac.
From Project Gutenberg
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