(1) A unit of pressure equal to 1 megadyne (106 dyne) per cm2 in the CGS system, 0.9869233 atmosphere, or 105 Pa (N/m2) in the SI. (2) A metal segment of greater length than width that serves to connect two or more parts of a removable partial denture.major connector. (3) A segment of tissue or bone that unites two or more similar structures. (4) In veterinary medicine, the ridged structure on the sole of the horse hoof that connects the wall of the hoof with the sole adjacent to the frog, one bar to each side of the frog. It forms the lateral wall of the paracuneal groove (lateral sulcus) of the frog at the heel.