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 air cell air cell /ɛr sɛl/

noun

  1. A tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways  ( air cell , air sac , alveolus )
    a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
      The alveolus is the tiny air sac in the lungs where oxygen and carbon dioxide exchange takes place.
    The alveolus is the tiny air sac in the lungs where oxygen and carbon dioxide exchange takes place.