/ Dictionary / Index T tribasic: Meaning and Definition of Find definitions for: tri•ba•sic Pronunciation: (trī-bā'sik), [key] — adj. Chem. (of an acid) having three atoms of hydrogen replaceable by basic atoms or groups. containing three atoms or groups, each having a valence of one, as tribasic sodium phosphate, NaPO. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tribalism tribasic sodium phosphate 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