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.

1850–55; de- + hydrate

2. See evaporate. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dehydrate (diːˈhaɪdreɪt, ˌdiːhaɪˈdreɪt)
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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1854, from Gk. hydor "water" (see water (n.1)). A chemical term at first, given a broader extension 1880s. Related: Dehydration (1834).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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Example sentences for dehydrating
The de particles abrade the bedbug, essentially dehydrating it of water and lipids.
Sulfuric acid is also used as a general dehydrating agent in its concentrated form.
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