atrium
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- n any chamber that is connected to other chambers or passageways (especially one of the two upper chambers of the heart)
- n the central area in a building; open to the sky
- The tall atrium that greets visitors on the second floor gives the interior an early dose of literally high drama, but what work of art can compete with its altitudes?.
- The Hyatt's dramatic five-story atrium lobby was transected by three walkways.
- Some would also flow into the donor heart's left atrium and its left ventricle, where the child's young, muscular pumping chamber would give the patient's heart a boost.