hydrate

[hahy-dreyt]
noun
1.
any of a class of compounds containing chemically combined water. In the case of some hydrates, as washing soda, Na 2 CO 3 ⋅10H 2 O, the water is loosely held and is easily lost on heating; in others, as sulfuric acid, SO 3 ⋅H 2 O, or H 2 SO 4 , it is strongly held as water of constitution.
verb (used with object), verb (used without object), hydrated, hydrating.
2.
to combine chemically with water.

Origin:
1795–1805; hydr-1 + -ate2

hydration, noun
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World English Dictionary
hydrate (ˈhaɪdreɪt)
 
n
1.  a chemical compound containing water that is chemically combined with a substance and can usually be expelled without changing the constitution of the substance
2.  a chemical compound that can dissociate reversibly into water and another compound. For example sulphuric acid (H2SO4) dissociates into sulphur trioxide (SO3) and water (H2O)
3.  (not in technical usage) a chemical compound, such as a carbohydrate, that contains hydrogen and oxygen atoms in the ratio two to one
 
vb
4.  to undergo or cause to undergo treatment or impregnation with water
 
[C19: from hydro- + -ate1]
 
hy'dration
 
n
 
'hydrator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

hydrate
1802, "compound of water and another chemical," from Fr. hydrate, coined by Fr. chemist Joseph-Louis Proust (1754-1826) from Gk. hydr-, stem of hydor "water" (see water (n.1)). The verb is first attested 1850.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

hydrate hy·drate (hī'drāt')
n.
A solid compound containing water molecules combined in a definite ratio as an integral part of a crystal. v. hy·drat·ed, hy·drat·ing, hy·drates

  1. To rehydrate.

  2. To supply water to a person or thing in order to restore or maintain fluid balance.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
hydrate   (hī'drāt')  Pronunciation Key 
Noun   A compound produced by combining a substance chemically with water. Many minerals and crystalline substances are hydrates.

Verb  
  1. To combine a compound with water, especially to form a hydrate.

  2. To supply water to a person in order to restore or maintain a balance of fluids.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

hydrate

any compound containing water in the form of H2O molecules, usually, but not always, with a definite content of water by weight. The best-known hydrates are crystalline solids that lose their fundamental structures upon removal of the bound water. Exceptions to this are the zeolites (aluminum silicate minerals or their synthetic analogues that contain water in indefinite amounts) as well as similar clay minerals, certain clays, and metallic oxides, which have variable proportions of water in their hydrated forms; zeolites lose and regain water reversibly with little or no change in structure

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Coconut water can hydrate as well as a sports drink if it has enough sodium.
Soaking in the tub does hydrate the skin, but only briefly.
The treatment is supposed to hydrate skin immediately, making the face appear
  smoother and plumper.
Hydrate has been touted as one of the fuels of the future, but the technology
  doesn't exist to tap it.
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