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[dee-hahy-dreyt] /diˈhaɪ dreɪt/
verb (used with object), dehydrated, dehydrating.
to deprive (a chemical compound) of water or the elements of water.
to free (fruit, vegetables, etc.) from moisture for preservation; dry.
to remove water from (the body or a tissue).
to deprive of spirit, force, or meaning; render less interesting or effectual.
verb (used without object), dehydrated, dehydrating.
to lose water or moisture:
Milk dehydrates easily.
Origin of dehydrate
1850-55; de- + hydrate
Synonym Study
2. See evaporate. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for dehydrate
  • But avoid alcoholic drinks, coffee or soda because they can dehydrate you.
  • The yellow substance was gypsum, or calcium sulfate dehydrate, a common component of plaster.
  • Freezing organs isn't an option, as the cells dehydrate.
  • But if you're drinking too much alcohol or caffeine and not enough water or other liquids, you can dehydrate.
  • Do not break eggs in advance as membranes may dehydrate and crack.
  • Caffeinated drinks and alcohol dehydrate the body, which increases the need for drinking water.
  • As they dehydrate, the path shrinks and becomes disconnected, restricting proton movement.
  • The object is to dehydrate the plant, flower, seed pod etc so that it can no longer reproduce.
  • Since they dehydrate faster, they need to drink plenty of fluids.
British Dictionary definitions for dehydrate


/diːˈhaɪdreɪt; ˌdiːhaɪˈdreɪt/
to lose or cause to lose water; make or become anhydrous
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
to lose or deprive of water, as the body or tissues
Derived Forms
dehydration, noun
dehydrator, 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
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Word Origin and History for dehydrate

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

Online Etymology Dictionary, © 2010 Douglas Harper
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dehydrate in Medicine

dehydrate (dē-hī'drāt')
v. de·hy·drat·ed, de·hy·drat·ing, de·hy·drates

  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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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