/ Dictionary / Index T trilithon: Meaning and Definition of Find definitions for: tri•lith•on Pronunciation: (trī-lith'on, trī'lu-thon'), [key] — n. a prehistoric structure consisting of two upright stones supporting a horizontal stone. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. triliteralism trill Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language