v. t.
n. [ Cf. F. bissection. ] Division into two parts, esp. two equal parts. [ 1913 Webster ]
n. One who, or that which, bisects; esp. (Geom.) a straight line which bisects an angle. [ 1913 Webster ]
n. The line bisecting the angle between the optic axes of a biaxial crystal. [ 1913 Webster ]