air sac

Noun
  1. A tiny sac for holding air in the lungs;
    Formed by the terminal dilation of tiny air passageways (synset 105536028)
    is a type of: sac - a structure resembling a bag in an animal
    is a part of: lung - either of two saclike respiratory organs in the chest of vertebrates; serves to remove carbon dioxide and provide oxygen to the blood
    same as: air cell, alveolus
  2. Any of the thin-walled extensions of the tracheae of insects (synset 102470515)
    is a type of: sac - a structure resembling a bag in an animal
    is a part of: insect - small air-breathing arthropod
  3. Any of the membranous air-filled extensions of the lungs of birds (synset 102470377)
    is a type of: sac - a structure resembling a bag in an animal
    is a part of: bird - warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings

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