'Polybasic' definitions:

Definition of 'Polybasic'

From: GCIDE

Polybasic \Pol`y*ba"sic\, 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. [1913 Webster]