adjective Chemistry.
(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, Na 3 PO 4 .

1830–40; tri- + basic

tribasicity [trahy-bey-sis-i-tee] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tribasic (traɪˈbeɪsɪk)
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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American Heritage
Medical Dictionary

tribasic tri·ba·sic (trī-bā'sĭk)

  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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