/ ˈeɪtriəm; NAmE / noun
1.
a large high space, usually with a glass roof, in the centre of a modern building
2.
an open space in the centre of an ancient Roman villa (= a large house)
3.
( anatomy ) either of the two upper spaces in the heart that are used in the first stage of sending the blood around the body
SYN auricle
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WORD ORIGIN
late 16th cent.: from Latin .