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atrium 
  n pl , atria 
1 the open main court of a Roman house 
2 a central often glass-roofed hall that extends through several storeys in a building, such as a shopping centre or hotel 
3 a court in front of an early Christian or medieval church, esp. one flanked by colonnades 
4  (Anatomy) a cavity or chamber in the body, esp. the upper chamber of each half of the heart 
  (C17: from Latin; related to ater black, perhaps originally referring to the part of the house that was blackened by smoke from the hearth) 
♦  atrial  adj 



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