• synonyms


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 of tribasic

  • 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.