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