/ Dictionary / Index T tetragonal trisoctahedron: Meaning and Definition of Find definitions for: tetrag'onal trisoctahe'dron Pronunciation: [key] a trisoctahedron the faces of which are quadrilaterals; trapezohedron. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tetragonal tetragram Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language