Carbonic anhydride

Carbonic anhydride may refer to:

• Carbon dioxide, the acidic oxide of carbonic acid
• Dicarbonic acid, the Template:Chem name of carbonic acid using two molecules
• 1,3-Dioxetanedione, the dianhydride of carbonic acid using two molecules
• 1,3,5-Trioxanetrione, the dianhydride of carbonic acid using three molecules