Webster’s Revised Unabridged Dictionary · 1913
Polybasic
Pol′y·ba′sic (·bā′sĭk), a. [Poly- + basic.] (Chem.) Capable of neutralizing, or of combining with, several molecules of a monacid base; having several hydrogen atoms capable of being replaced by basic radicals; — said of certain acids; as, sulphuric acid is polybasic.