The Collaborative International Dictionary
Dicarbonic
Dicarbonic \Di`car*bon"ic\, a. [Pref. di- + carbonic.] (Chem.) Containing two carbon residues, or two carboxyl or radicals; as, oxalic acid is a dicarbonic acid.
Wiktionary
dicarbonic
a. (context chemistry English) Containing two carbon residues, or two carboxyl radicals.