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Any chemical compound formed by the removal of water. An acid anhydride is a nonmetal oxide that forms an acid when combined with water, e.g., SO3 becomes H2SO4. A basic anhydride is a metal oxide that forms a base when combined with water, e.g., CaO becomes Ca(OH)2.

(Not to be confused with Anhydrous or Anhydrite.)

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Hoechst Celanese Corporation, Dictionary of Fiber & Textile Technology (older version called Man-made Fiber and Textile Dictionary, 1965), Hoechst Celanese Corporation, Charlotte NC, 1990
  • Theodore J. Reinhart, 'Glossary of Terms', Engineered Plastics, ASM International, 1988