/ Dictionary / Index T triphosphoric acid: Meaning and Definition of Find definitions for: tri'phos•phor'ic ac'id Pronunciation: (trī'fos-fôr'ik, -for'-, trī"-), [key] — Chem. Chem. the hypothetical acid HPO, known chiefly by its salts. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. triphosphate triphthong Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language