a central hall in a modern building, typically rising through several stories and having a glazed roof

plans call for a new atrium to be built behind the facade

the full-height glass atrium allows light to flood into the home

each of the two upper cavities of the heart from which blood is passed to the ventricles. The right atrium receives deoxygenated blood from the veins of the body, the left atrium oxygenated blood from the pulmonary vein