TRISECT

trisect

(verb) cut in three; “trisect a line”

Source: WordNet® 3.1

Verb

trisect (third-person singular simple present trisects, present participle trisecting, simple past and past participle trisected)

(transitive) to cut into three pieces

(transitive, mathematics) to divide a quantity, angle etc into three equal parts

Source: Wiktionary

Tri*sect", v. t. [imp. & p. p. Trisected; p. pr. & vb. n. Trisecting.] Etym: [Pref. tri- + L. sectus, p. p. of secare to cut. See Section.]

1. To cut or divide into three parts.

2. (Geom.)

Definition: To cut or divide into three equal parts.

Source: Webster’s Unabridged Dictionary 1913 Edition