/ Dictionary / Index T trigonum: Meaning and Definition of Find definitions for: tri•go•num Pronunciation: (trī-gō'num), [key] — pl. -na trigone. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trigonous trigram Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language