Definition of atrium noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈeɪtriəm//
    ; NAmE NAmE//ˈeɪtriəm//
    (pl. atria
    BrE BrE//ˈeɪtriə//
    ; NAmE NAmE//ˈeɪtriə//
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  1. 1 a large high space, usually with a glass roof, in the centre of a modern building The reception was held in the atrium. See related entries: Structures
  2. 2 an open space in the centre of an ancient Roman villa (= a large house)
  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
  4. Word Origin late 16th cent.: from Latin.
See the Oxford Advanced American Dictionary entry: atrium