atrium
n. countablen. a large, open space inside a building that often has a glass roof. It can also mean one of the two top chambers in your heart that receive blood.
n. a central, open-roofed hall or court in an ancient Roman house, or a modern large open space within a building. In anatomy, refers to either of the two upper cavities of the heart into which blood is passed to the ventricles.
The hotel guests gathered in the sunlit atrium for breakfast.
Architects designed the new office complex with a five-story atrium to maximize natural light in the interior workspaces.
The surgeon carefully monitored the pressure within the left atrium to ensure the valve replacement was functioning correctly without causing fluid backup in the lungs.
From Latin ātrium (“entry hall”), from Etruscan.
The plural form can be either 'atriums' or the Latinate 'atria', with the latter being more common in medical and scientific contexts.