a large high space, usually with a glass roof, in the centre of a modern building （现代建筑物中央通常带有玻璃屋顶的）中庭，中厅 The reception was held in the atrium. 招待会在中庭举行。
an open space in the centre of an ancient Roman villa (= a large house) （古罗马大宅的）天井 - (
anatomy 解剖学 either of the two upper spaces in the heart that are used in the first stage of sending the blood around the body 心房
Word Originlate 16th cent.: from Latin.