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 Originlate 16th cent.: from Latin.
See the Oxford Advanced American Dictionary entry: atrium