TRISECT

Tri‐sect″ (?), v. t. [imp. & p. p. Trisected; p. pr. & vb. n. Trisecting.] [[Pref. tri- + L. sectus, p. p. of secare to cut. See Section.]] 1. 1. To cut or divide into three parts.
2. 2. (Geom.) To cut or divide into three equal parts.