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See more synonyms for tribasic on Thesaurus.com
adjective Chemistry.
  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, Na3PO4.
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Origin of tribasic

First recorded in 1830–40; tri- + basic
Related formstri·ba·sic·i·ty [trahy-bey-sis-i-tee] /ˌtraɪ beɪˈsɪs ɪ ti/, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for tribasic

Historical Examples

  • This salt, which is tribasic, is also formed when1058 the preceding crystallised salts are put into hot water.

    Cooley's Practical Receipts, Volume II

    Arnold Cooley

  • Tribasic sodium phosphate alone without the addition of the carbonate will also give good results.

  • Being a tribasic acid, it forms acid as well as normal salts.

  • Morphine itself is a tribasic meconate, and narcotin, of course, another opium derivative.

British Dictionary definitions for tribasic


  1. (of an acid) containing three replaceable hydrogen atoms in the molecule
  2. (of a molecule) containing three monovalent basic atoms or groups in the molecule
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

tribasic in Medicine


  1. Relating to an acid containing three replaceable hydrogen atoms per molecule.
  2. Relating to a base or salt containing three univalent basic atoms or radicals per molecule.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.