Hypertext Webster Gateway: "tribasic"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Tribasic \Tri*ba"sic\, a. [Pref. tri- + basic.] (Chem.)
Capable of neutralizing three molecules of a monacid base, or
their equivalent; having three hydrogen atoms capable of
replacement by basic elements on radicals; -- said of certain
acids; thus, citric acid is a tribasic acid.
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