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[hahy-dreyt] /ˈhaɪ dreɪt/
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.
to combine chemically with water.
Origin of hydrate
1795-1805; hydr-1 + -ate2
Related forms
hydration, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for hydrate
  • 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.
  • Take a look at a hydrate chart and see under what conditions they form and are released.
  • And the lighting is intense, so you need to hydrate yourself.
  • She experimented until she finally came up with formulations to hydrate, soften, and heal his hands and feet.
  • Emperor penguins will eat ice to cool and hydrate, and they will even swallow rocks to help aid digestion.
  • The surface is characterized by various forms of carbo hydrate and possibly water ice eroded by liquid carbo hydrates.
  • High temperatures hydrate living plants by boosting evaporation at the leaf cover, driving the pump plants use to draw water.
British Dictionary definitions for hydrate


a chemical compound containing water that is chemically combined with a substance and can usually be expelled without changing the constitution of the substance
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)
(not in technical usage) a chemical compound, such as a carbohydrate, that contains hydrogen and oxygen atoms in the ratio two to one
to undergo or cause to undergo treatment or impregnation with water
Derived Forms
hydration, noun
hydrator, noun
Word Origin
C19: from hydro- + -ate1
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 hydrate

1802, "compound of water and another chemical," from French hydrate, coined c.1800 by French chemist Joseph-Louis Proust (1754-1826) from Greek hydr-, stem of hydor "water" (see water (n.1)).


1850, "to form a hydrate;" 1947 as "to restore moisture;" from Greek hydr-, stem of hydor "water" (see water (n.1)) + -ate (2). Related: Hydrated; hydrating.

Online Etymology Dictionary, © 2010 Douglas Harper
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hydrate in Medicine

hydrate hy·drate (hī'drāt')
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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hydrate in Science
Noun  A compound produced by combining a substance chemically with water. Many minerals and crystalline substances are hydrates.

  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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