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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.