diameter
di.am.e.ter \di--'am-*t-*r\ \-'am-*-tr*l\ n [ME diametre, fr. MF, fr. L diametros, fr. Gk, fr. dia- + ]metron measure 1: a chord passing through the center of a figure or body 2: the length of a straight line through the center of an object - di.am.e.tral aj