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|Noun||1.||atrium cordis - the upper chamber of each half of the heart|
atrial auricle, auricle, auricula atrii - a small conical pouch projecting from the upper anterior part of each atrium of the heart
auricular appendage, auricular appendix, auricula - a pouch projecting from the top front of each atrium of the heart
atrium - any chamber that is connected to other chambers or passageways (especially one of the two upper chambers of the heart)
atrium dextrum, right atrium, right atrium of the heart - the right upper chamber of the heart that receives blood from the venae cavae and coronary sinus