Atrium

Atrium may refer to:

Atrium (architecture), a large open space within a building usually with a glass roof
Atrium (alveoli), microscopic air sacs in lungs
Atrium (heart), an anatomical structure of the heart
Atrium of the ventricular system of the brain
Atrium (Cardiff), a University of Glamorgan (Wales) building in Cardiff
atrium, the genital structure next to the genital aperture in the reproductive system of gastropods

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