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 (trī′sĕkt′, trī-sĕkt′)
tr.v. tri·sect·ed, tri·sect·ing, tri·sects
To divide into three equal parts.

tri′sec′tion (trī′sĕk′shən, trī-sĕk′-) n.
tri′sec′tor (trī′sĕk′tər, trī-sĕk′-) n.
References in periodicals archive ?
Upon the initial grossing of the specimens, 25 of the 47 biopsies (53%) were bisected, 15 (32%) were trisected, 6 (13%) were quadrisected, and 1 case (2%) was sectioned into 6 pieces.
That, as I see it, is the benefit of this trisected structure (which, I should note, could just as well be bisected or quadrisected; divide it any way you like).
He stands in the middle of a rectangular picture plane trisected into three bands: the foreground on which the figure stands, the scythed field and the broad empty blue stripe of the overhanging sky.
They sought to view everyday objects such as wine glasses, bottles, and musical instruments, as well as portraits and landscapes, as no longer being in two dimensions, but as trisected elements, as though the human eye could see around corners even when looking at a flat object.
Despite (some say, because of) reforms that, in 1791, produced Europe's first written constitution, the Commonwealth was ultimately subjugated and trisected by neighboring Austria, Prussia, and Russia.
Note that our folds have trisected the right angles at A and B, and produced the three altitudes of the equilateral triangle also.
So here we are today, with thousands of dead, Iraq ethnically cleansed and trisected, our nation diminished and our economy in turmoil, and Laurien DuTremble of Northridge is still singing the praises of George Bush and railing about Bill Clinton and Al Gore.