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Definitions and Synonyms of air sac | Another word for air sac | What is air sac?

Definition 1: any of the membranous air-filled extensions of the lungs of birds - [noun denoting animal]

(air sac is a kind of ...) a structure resembling a bag in an animal

(... is part of air sac) warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings

Definition 2: any of the thin-walled extensions of the tracheae of insects - [noun denoting animal]

(air sac is a kind of ...) a structure resembling a bag in an animal

(... is part of air sac) small air-breathing arthropod

Definition 3: a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways - [noun denoting body]

Synonyms for air sac in the sense of this definition

(air sac is a kind of ...) a structure resembling a bag in an animal

(... is part of air sac) either of two saclike respiratory organs in the chest of vertebrates; serves to remove carbon dioxide and provide oxygen to the blood

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