/ Dictionary / Index T tricyanic acid: Meaning and Definition of Find definitions for: tri'cy•an'ic ac'id Pronunciation: (trī'sī-an'ik, trī"-). [key] See cyanuric acid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tricuspid valve tricycle Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language