/ Dictionary / Index T trisodium phosphate: Meaning and Definition of Find definitions for: triso'dium phos'phate Pronunciation: [key] — Chem. Chem. See(def. 3). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trisodium trisome Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language