atrium - definition and synonyms

noun [countable] 

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/ˈeɪtriəm/
singularatrium
pluralatriums or atria
  1. 1
    a large open hall that goes up through all the levels of a building to the roof, which is usually made of glass
  2. 2
    medical each of the two upper spaces in your heart, which force blood into your ventricles (=lower spaces)