/ Dictionary / Index T trisect: Meaning and Definition of Find definitions for: tri•sect Pronunciation: (trī-sekt', trī'sekt), [key] — v.t. to divide into three parts, esp. into three equal parts. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: trisect (Thesaurus) trisaccharide trisepalous Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language