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Definition of atrium : 1. A cavity in ascidians into which the intestine and generative ducts open, and which also receives the water from the gills. See Ascidioidea.
2. A cavity, entrance, or passage; as, the atrium, or atrial cavity, in the body wall of the amphioxus; an atrium of the infundibula of the lungs, etc.
3. A square hall lighted from above, into which rooms open at one or more levels.
4. An open court with a porch or gallery around three or more sides; especially at the entrance of a basilica or other church. The name was extended in the Middle Ages to the open churchyard or cemetery.
5. The main part of either auricle of the heart as distinct from the auricular appendix. Also, the whole articular portion of the heart.

Synonyms:

atheroma, cubicle, A, aorta, chamber, courtyard, quad, beat, anteroom, close, boiler room, artery, enclosure, B, ABO system, quadrangle, place, airlock, antechamber, booth, yard, bleeding, changing room, anticoagulant, court, control room

Usage examples:

• Through the middle one they were coming out into the atrium; and as the big doors swung rapidly back and forth there were glimpses on the other side of a vast space full of rich yellow light. - "The Guests Of Hercules", C. N. Williamson and A. M. Williamson.
• The hall was constructed in the manner of a Roman atrium, and from the oblong pool of turgid water in the centre a troop of fat and otiose rats fled weakly squealing at my approach. - "Prince Zaleski", M.P. Shiel.
• The most important room in the Roman house was the atrium. - "Roman Women Woman: In All Ages and in All Countries, Volume 2 (of 10)", Alfred Brittain.