• (a.) Divalent; -- said of a base or radical as capable of saturating two acid monad radicals or a dibasic acid. Cf. Dibasic, a., and Biacid.
Di·ac'id adjective [ Prefix di- + acid .] (Chemistry) Divalent; -- said of a base or radical as capable of saturating two acid monad radicals or a dibasic acid. Confer Dibasic , adjective , and Biacid . 
Type: Term Pronunciation: dī-as′id Definitions: 1. Denoting a substance containing two ionizable hydrogen atoms per molecule; more generally, a base capable of combining with two hydrogen ions per molecule.
diacid Capable of combining with two acid radicals.
capable of combining with two molecules of a monobasic acid. · (of an acid or a salt) having two replaceable hydrogen atoms.