from The American Heritage® Dictionary of the English Language, 5th Edition.
noun A solid compound containing water molecules combined in a definite ratio as an integral part of the crystal. Often used in combination.
intransitive verb To rehydrate.
intransitive verb To supply water to (a person, for example) in order to restore or maintain fluid balance.
intransitive verb To become a hydrate.
from The Century Dictionary.
To combine or impregnate with water.
To form into a hydrate.
noun In chem., a compound of a class which may be regarded as formed upon the same type as water, or by the substitution of a metallic atom, or a basic radical, for one of the atoms of hydrogen in water: for example, HOH, water; KOH, potassium hydrate; NH4OH, ammonium hydrate.
from the GNU version of the Collaborative International Dictionary of English.
noun A compound formed by the union of water with some other substance, generally forming a neutral body, as certain crystallized salts.
noun A substance which does not contain water as such, but has its constituents (hydrogen, oxygen, hydroxyl) so arranged that water may be eliminated; hence, a derivative of, or compound with, hydroxyl; hydroxide
transitive verb To form into a hydrate; to combine with water.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
noun chemistry A solid compound containing or linked to watermolecules.
noun inorganic chemistry, rareWater.
verb transitive To take up, consume or become linked to water.
verb slang To drink water.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun any compound that contains water of crystallization
verb supply water or liquid to in order to maintain a healthy balance
verb cause to be hydrated; add water or moisture to
verb become hydrated and combine with water
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
From French hydrate.
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Examples
Methane hydrate is a crystalline solid that consists of methane surrounded by a cage of water molecules.
A hydrate is created when a molecule of gas — in this case, methane or natural gas — is trapped by high pressures and low temperatures inside a cage of water molecules.
Methane hydrate is essentially frozen natural gas .... there is enough of it just off the North Carolina coast to power the entire country for the next 50 years ....
And in both cases, one of the drugs which was used, at least (ph) in Anna Nicole Smith, was an unusual drug, chloral hydrate, which is not used usually as a sleeping pill.
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