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See more synonyms for dehydrate on Thesaurus.com
verb (used with object), de·hy·drat·ed, de·hy·drat·ing.
  1. to deprive (a chemical compound) of water or the elements of water.
  2. to free (fruit, vegetables, etc.) from moisture for preservation; dry.
  3. to remove water from (the body or a tissue).
  4. to deprive of spirit, force, or meaning; render less interesting or effectual.
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verb (used without object), de·hy·drat·ed, de·hy·drat·ing.
  1. to lose water or moisture: Milk dehydrates easily.
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Origin of dehydrate

First recorded in 1850–55; de- + hydrate

Synonym study

2. See evaporate.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for dehydrate

dry, drain, sear, parch, evaporate, exsiccate, desiccate

Examples from the Web for dehydrate

Historical Examples of dehydrate

  • It is employed to dehydrate certain oils with which the pork-packer adulterates lard.

    Highways and Byways in Surrey

    Eric Parker

  • Drop absolute alcohol on to the section from a drop bottle, to dehydrate it.

  • Decolourise and dehydrate rapidly with absolute alcohol until there remains only a very faint bluish tint.

  • Flood with several changes of absolute alcohol to dehydrate the section.

British Dictionary definitions for dehydrate


  1. to lose or cause to lose water; make or become anhydrous
  2. to lose or cause to lose hydrogen atoms and oxygen atoms in the proportions in which they occur in water, as in a chemical reaction
  3. to lose or deprive of water, as the body or tissues
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Derived Formsdehydration, noundehydrator, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for dehydrate


1854, from de- + hydrate (v.). A chemical term at first, given a broader extension 1880s. Related: Dehydration (1834).

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Online Etymology Dictionary, © 2010 Douglas Harper

dehydrate in Medicine


  1. To remove water from; make anhydrous.
  2. To preserve by removing water from something, such as vegetables.
  3. To deplete the bodily fluids of an individual.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.