Definition of acid anhydride in US English:

acid anhydride


  • 1An oxide which combines with water to form an acid.

  • 2Any of a class of organic compounds whose molecule contains two acyl groups linked by an oxygen atom (formally derived by the combination of two carboxylic acid groups with the loss of a molecule of water).


Mid 19th century; earliest use found in Henry Watts (1815–1884), chemist.