Carbonic anhydride may refer to:

• Carbon dioxide, the acidic oxide of carbonic acid
• Dicarbonic acid, the monoanhydride 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

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