Air Sac Definition

noun
Any of the air-filled cavities in a bird's body, having connections to the lungs.
Webster's New World
A saclike, thin-walled enlargement in the trachea of an insect.
American Heritage
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.
American Heritage Medicine
A saclike, thin-walled enlargement in the trachea of an insect.
American Heritage Medicine
An inflatable pouch attached to the larynx in certain mammals, including the nonhuman great apes.
American Heritage Medicine
Synonyms:
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other
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.
American Heritage Science
A saclike enlargement in the trachea of an insect.
American Heritage Science
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.
American Heritage Science

Other Word Forms of Air Sac

Noun

Singular:
air sac
Plural:
air sacs

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