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The Collaborative International Dictionary
Trisecting

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.

Wiktionary
trisecting

vb. (present participle of trisect English)