From The Collaborative International Dictionary of English v.0.48 [gcide]:
Polyacid \Pol'y*ac"id\, adjective [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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