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The Collaborative International Dictionary
Trisect

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.

Douglas Harper's Etymology Dictionary
trisect

1690s, from tri- "three" + Latin sectus "cut," past participle of secare "to cut" (see section (n.)). Probably patterned on bisect. Related: Trisected; trisecting; trisection (1660s).

Wiktionary
trisect

vb. 1 (context transitive English) to cut into three pieces 2 (context transitive mathematics English) to divide a quantity, angle etc into three equal parts

WordNet
trisect

v. cut in three; "trisect a line"

Usage examples of "trisect".

A double-bind game is a game with self-contradictory rules, a game doomed to perpetual self-frustration--like trying to invent a perpetual-motion machine in terms of Newtonian mechanics, or trying to trisect any given angle with a straightedge and compass.

Newtonian mechanics, or trying to trisect any given angle with a straightedge and compass.

I hope, you have found my working correct, I may draw the two lines which will trisect the triangle.

As with stone, so with every other body: we should see that in this thing, body, there are three distinguishable characteristics--the pseudo-substance, the quantity, the quality--though they all make one and are only logically trisected, the three being found to constitute the unit thing, body.

He had thoughtfully removed his suit jacket and so his white shirt, neatly trisected by suspenders, stood out brilliantly among the cornstalks.

On the building sides, the trisected peace sign was spray-painted, while harsher words praised the NLF in Vietnam, and Huey Newton, then in jail for supposedly killing a police officer.

Deep lines trisected it from his nose to his jaws and his mouth was clamped tightly above a weak chin.

Professor Marmion has apparently trisected the triangle, squared the circle, and doubled the cube.

Radiating from it flames licked along the logs in the three shallow ditches which trisected the camp site, and as the central fire burned down the ends of the long logs were pushed into it and new fuel supplied.

A double-bind game is a game with self-contradictory rules, a game doomed to perpetual self-frustration--like trying to invent a perpetual-motion machine in terms of Newtonian mechanics, or trying to trisect any given angle with a straightedge and compass.

Newtonian mechanics, or trying to trisect any given angle with a straightedge and compass.

A line of glow-tubes ran around the junction of bulkhead and ceiling and trisected the overhead: the 50ft roar of blowers made a background to the voices of his shipmates.

Above their heads, the navy, red and white trisected Khmer flag with the image 6f Angkor Wat at its centre, flapped and rippled in the sporadic breeze, folding in on itself like Malis' expressive fingers in the periods of stillness.