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poly·ba·sic -'bā-sik, -zik adj having more than one hydrogen atom replaceable by basic atoms or radicals used of acids
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poly·ba·sic (pol″e-baґsik) [poly- + basic] 1. denoting any acid which has several hydrogen atoms replaceable by a base. 2. denoting any salt of a polybasic acid formed by replacing some or all of its hydrogen atoms by a base.Medical dictionary. 2011.