Dictionary
2 ENTRIES FOUND:

atrium

noun atri·um \ˈā-trē-əm\

: an open area inside a tall building that has windows to let light in from above

: one of two sections of the heart that take in blood from the veins

plural atria \-trē-ə\ also atri·ums

Full Definition of ATRIUM

1
:  the central room of a Roman house
2
plural usually atriums
a :  a rectangular open patio around which a house is built
b :  a many-storied court in a building (as a hotel) usually with a skylight
3
[New Latin, from Latin] :  an anatomical cavity or passage; especially :  the chamber or either of the chambers of the heart that receives blood from the veins and forces it into the ventricle or ventricles — see heart illustration
atri·al \-trē-əl\ adjective

Origin of ATRIUM

Latin
First Known Use: 1577

atrium

noun atri·um \ˈā-trē-əm\   (Medical Dictionary)
plural atria \-trē-ə\ also atri·ums

Medical Definition of ATRIUM

:  an anatomical cavity or passage; especially :  a chamber of the heart that receives blood from the veins and forces it into a ventricle or ventricles

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