dicarbonic

Century Dictionary and Cyclopedia

1. Containing two carbonic-acid radicals, — O.CO.OH, in the molecule. Sometimes incorrectly used for dicarboxylic.

Wiktionary

1. adj. chemistry Containing two carbon residues, or two carboxyl radicals.

GNU Webster's 1913

1. adj. (Chem.) Containing two carbon residues, or two carboxyl groups or radicals. In the latter sense, synonymous with dicarboxylic.