noun (atri, a, pl2=atriums)
Etymology: From atriumLatin, Ätrium (entry hall)
- (context, architecture) A square hall lighted from above, into which rooms open at one or more levels.
- (anatomy) A body cavity or chamber, especially an upper chamber of the heart that receives blood from the veins and forces it into a ventricle. An auricle. In higher vertebrates, the right atrium receives blood from the superior vena cava and inferior vena cava, and the left atrium receives blood from the left and right pulmonary veins.
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Full Definition of atrium