atrium
US /ˈeɪ.tri.əm/
UK /ˈeɪ.tri.əm/
1.
the central hall or court of an ancient Roman house, typically having a an open roof and a shallow pool for rainwater.
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The ancient Roman house featured a beautiful atrium with a compluvium.
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Archaeologists discovered remnants of an atrium in the ruins.
2.
an open-roofed entrance court in a modern building.
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The hotel lobby featured a grand atrium with a glass ceiling.
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The shopping mall's atrium was filled with natural light.
3.
each of the two upper cavities of the heart from which blood passes to the ventricles.
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The right atrium receives deoxygenated blood from the body.
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Blood flows from the left atrium into the left ventricle.