What does CENTR stand for?

Central

At or near the center.In anatomy and medicine, central is the opposite of "peripheral" which means away from the center. The word "peripheral" comes from the Greek "peripheria". A central line is an infusion tube that is located in or near the heart. A Swan-Ganz cather with its tip, for example, in the right atrium and ventricle of the heart is a central line. On the other hand, a peripheral line is located on the periphery of the circulatory system.