/ Dictionary / Index T trifacial: Meaning and Definition of Find definitions for: tri•fa•cial Pronunciation: (trī-fā'shul), [key] — adj. trigeminal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. triethyl orthoformate trifacial neuralgia Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language