Science, Tech, Math › Science Acid Anhydride Definition in Chemistry Chemistry Glossary Definition of Acid Anhydride Share Flipboard Email Print mirzamlk / Getty Images Science Chemistry Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated October 21, 2019 An acid anhydride is a nonmetal oxide which reacts with water to form an acidic solution. In organic chemistry, an acid anhydride is a functional group consisting of two acyl groups joined together by an oxygen atom. Acid anhydride also refers to compounds containing the acid anhydride functional group. Acid anhydrides are named from the acids that created them. The "acid" part of the name is replaced with "anhydride." For example, the acid anhydride formed from acetic acid would be acetic anhydride. Sources IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (2006).Nelson, D. L.; Cox, M. M. (2000). Lehninger, Principles of Biochemistry, 3rd Ed. Worth Publishing: New York. ISBN 1-57259-153-6.Panico R., Powell W.H., Richer J.C., eds. (1993). "Recommendation R-5.7.7". A Guide to IUPAC Nomenclature of Organic Compounds. IUPAC/Blackwell Science. pp. 123–25. ISBN 0-632-03488-2.