plural atria
ˈā-trē-ə
also atriums
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 (such 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
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Merriam-Webster unabridged
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