anhydride
Americannoun
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a compound formed by removing water from a more complex compound: an oxide of a nonmetal acid anhydride or a metal basic anhydride that forms an acid or a base, respectively, when united with water.
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a compound from which water has been abstracted.
noun
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a compound that has been formed from another compound by dehydration
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a compound that forms an acid or base when added to water
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Also called: acid anhydride, acyl anhydride. any organic compound containing the group -CO.O.CO- formed by removal of one water molecule from two carboxyl groups
Etymology
Origin of anhydride
1860–65; anhydr(ous) + -ide ( def. )
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Another makes acetic anhydride, a key ingredient of aspirin, and the third makes ethyl acetate, which is used as a solvent and for decaffeinating tea and coffee.
From BBC ● Sep. 22, 2026
These previously uncharacterized acid sulfuric anhydride products are almost certainly key contributors to atmospheric new particle formation and a way to efficiently incorporate carboxylic acids into atmospheric nanoparticles.
From Science Daily ● May 23, 2024
Gradually, water vapour from the air hydrolysed the polymer’s anhydride groups, causing decomposition of the film.
From Scientific American ● Sep. 8, 2017
A vacuum is created and then flooded with a liquid called acetic anhydride - effectively industrial vinegar - which is sucked into the spaces in the wood.
From BBC ● May 6, 2011
Add about 3 grams of the anhydrous sodium acetate, then 7.5 cc. of the acetic anhydride, and connect the flask with an upright Liebig condenser.
From Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. by E. G. Thomssen
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
