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:

Other Word Forms of Air Sac

Noun

Singular:
air sac
Plural:
air sacs

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Unscrambles

air sac