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. To cut or divide into three parts.

2. (Geom.) To cut or divide into three equal parts.