BT Yom 25b(37) :מר אזיל בתר {{שו}}<א>ברא דבשרא, ומר אזיל בתר שומנא דבשרא‏ : one scholar goes by (i.e., takes into consideration) the fleshy limb, while another master goes by the fleshy fat
See the entire entry for ˀăḇar, ˀeḇrā n.m. member, limb