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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.
Anatomy. 1  the projecting outer portion of the ear; pinna. 2  Also called auricular appendage. an ear-shaped appendage projecting from each atrium of the heart. ( 3 loosely) the atrium.