/ Dictionary / Index T trisoctahedron: Meaning and Definition of Find definitions for: tris•oc•ta•he•dron Pronunciation: (tris-ok"tu-hē'drun), [key] — pl. -drons, -dra a solid bounded by 24 identical faces in groups of three, each group corresponding to one face of an octahedron. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trismus trisodium Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language