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HOME >> BIOLOGY >> DICTIONARY. In modern architecture, an atrium (plural atria) is a large open space, often several stories high and having a glazed roof and/or large windows, often situated within an office building and usually located immediately beyond... Atrium (architecture), a large open space within a building.
Noun. 1. auricle-a small conical pouch projecting from the upper anterior part of each atrium of the heart. atrial auricle, auricula atrii. atrium cordis, atrium of the heart-the upper chamber of each half of the heart.