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Definition of Coronary sinus
1. Noun. A short sinus receiving most of the veins of the heart; empties into the right atrium.
Medical Definition of Coronary sinus
1. A short trunk receiving most of the cardiac veins, beginning at the junction of the great cardiac vein and the oblique vein of the left atrium, running in the posterior part of the coronary sulcus and emptying into the right atrium between the inferior vena cava and the atrioventricular orifice. Synonym: sinus coronarius. (05 Mar 2000)