9 Grammatical Pitfalls


[hahy-drey-tid] /ˈhaɪ dreɪ tɪd/
chemically combined with water in its molecular form.
(of paper pulp) beaten until gelatinous for making into water-resistant paper.
Origin of hydrated
1800-10; hydrate + -ed2
Related forms
nonhydrated, adjective
unhydrated, adjective


[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.
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 hydrated
  • When subjected to cold water it swells, and is called hydrated gelatin.
  • The water helps keep you hydrated, which greatly ameliorates tomorrow's hangover.
  • The hydration hose keeps the shark's gills hydrated to keep it alive.
  • For instance, both bodies contain minerals known as carbonates and hydrated silicates.
  • Users should stay well hydrated, as some of those ingredients act as diuretics.
  • The promoters have done a great job of keeping people hydrated.
  • It's another gentle abrasive, even better than hydrated silica at penetrating scratches in tooth enamel.
  • Check out the video to see how the ammo is hydrated and how the blasters work.
  • The surface is also laced with materials called hydrated sulfates, which formed in a more acidic and dryer environment.
  • Cuplike crowns above the canopy collect rainwater to keep the uppermost limbs hydrated.
British Dictionary definitions for hydrated


(of a compound) chemically bonded to water molecules


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 hydrated



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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hydrated 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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hydrated 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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