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Noun: atrium (atriums,atria)  ey-tree-um
  1. Any chamber that is connected to other chambers or passageways (especially one of the two upper chambers of the heart)
  2. The central area in a building; open to the sky

Derived forms: atria, atriums

Type of: chamber, court, courtyard

Part of: heart, pump, ticker [informal]

Encyclopedia: Atrium, Cardiff