THESAURUS
bisect
amputate, average, ax, bifurcate, branch, butcher, by two, carve, chop, cleave, cut, cut away, cut in two, cut off, dichotomize, dimidiate, dissever, divide, double, excise, fission, fissure, fold, fork, gash, hack, halve, hew, in half, incise, jigsaw, lance, middle, pare, prune, ramify, rend, rive, saw, scissor, sever, slash, slice, slit, snip, split, split in two, subdivide, sunder, tear, transect, whittle
ROGET THESAURUS
bisect
bisection
VB
bisect, halve, divide, split, cut in two, cleave dimidiate, dichotomize, go halves, divide with, separate, fork, bifurcate, branch off, out, ramify.