EXAMPLES | WORD ORIGIN noun any of a class of compounds containing chemically combined water. In the case of some hydrates, as washing soda, Na 2CO 3⋅10H 2O, the water is loosely held and is easily lost on heating; in others, as sulfuric acid, SO 3⋅H 2O, or H 2SO 4, it is strongly held as water of constitution. verb (used with or without object), hy·drat·ed, hy·drat·ing. to combine chemically with water. Origin of hydrate
First recorded in
1795–1805; hydr- 1
-ate 2 Related forms hy·dra·tion, noun
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for hydrate Contemporary Examples of hydrate Historical Examples of hydrate
The oxide and
hydrate change to carbonate, and therefore are good.
“Milk of lime” consists of a cream of the
hydrate and water.
Serpentine is a compound of silicate and
hydrate of magnesium.
hydrate is slightly soluble in water and reddens litmus.
An acid first obtained, by Plisson, from asparagin, by boiling it along with
hydrate of lead or of magnesia. British Dictionary definitions for hydrate noun 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 (H 2 SO 4) dissociates into sulphur trioxide (SO 3) and water (H 2 O) (not in technical usage) a chemical compound, such as a carbohydrate, that contains hydrogen and oxygen atoms in the ratio two to one verb to undergo or cause to undergo treatment or impregnation with water Derived Forms hydration, noun hydrator, noun Word Origin for hydrate
hydro- + -ate 1
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
Word Origin and History for hydrate n.
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)). v.
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
n. A solid compound containing water molecules combined in a definite ratio as an integral part of a crystal. v. To rehydrate. 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.
Noun A compound produced by combining a substance chemically with water. Many minerals and crystalline substances are hydrates. Verb To combine a compound with water, especially to form a hydrate. To supply water to a person in order to restore or maintain a balance of fluids.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.