atrium

Noun
  1. Any chamber that is connected to other chambers or passageways (especially one of the two upper chambers of the heart) (synset 105400366)
    is a type of: chamber - an enclosed volume in the body
    subtypes: atrium cordis, atrium of the heart - the upper chamber of each half of the heart
  2. The central area in a building;
    Open to the sky (synset 102757661)
    is a type of: court, courtyard - an area wholly or partly surrounded by walls or buildings

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