/ Dictionary / Index T tetrahedral: Meaning and Definition of Find definitions for: tet•ra•he•dral Pronunciation: (te"tru-hē'drul), [key] — adj. pertaining to or having the form of a tetrahedron. having four lateral planes in addition to the top and bottom. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Tetragrammaton tetrahedrite 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