Pol′y‐ac″id (?), a. [Poly- + acid.] (Chem.) Capable of neutralizing, or of combining with, several molecules of a monobasic acid; having more than one hydrogen atom capable of being replaced by acid radicals; — said of certain bases; as, calcium hydrate and glycerin are polyacid bases.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.