Definition of atrium noun from the Oxford Advanced American Dictionary

     

    atrium

     noun
    noun
    NAmE//ˈeɪtriəm//
     
    (pl. atria
    NAmE//ˈeɪtriə//
     
    , (or )atriums)
     
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  1. 1a large high space, usually with a glass roof, in the center of a modern building The reception was held in the atrium.
  2. 2an open space in the center of an ancient Roman villa
  3. 3(anatomy) either of the two upper spaces in the heart that are used in the first stage of sending the blood around the body synonym auricle
See the Oxford Advanced Learner's Dictionary entry: atrium