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Meaning of tribasic

tri•ba•sic

Pronunciation: (trī-bā'sik), [key]
— adj. Chem.
  1. (of an acid) having three atoms of hydrogen replaceable by basic atoms or groups.
  2. 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.