Tri‐ac″id (?), a. [Pref. tri- + acid.] (Chem.) Capable of neutralizing three molecules of a monobasic acid or the equivalent; having three hydrogen atoms which may be acid radicals; — said of certain bases; thus, glycerin is a triacid base.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.