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    air sac

    air sac - Dictionary definition and meaning for word air sac

    Definition
    (noun) a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
    Synonyms : air cell , alveolus
    Definition
    (noun) any of the thin-walled extensions of the tracheae of insects Definition
    (noun) any of the membranous air-filled extensions of the lungs of birds

Word used in video below:
text: a small sac of fluid located in the center of the human brain.
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