English Dictionary

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hydrate (ˈhaɪdreɪt



  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



  1. to undergo or cause to undergo treatment or impregnation with water

Derived Forms

hyˈdration  noun
ˈhydrator  noun

Word Origin

C19: from hydro- + -ate1


View thesaurus entry
= moisten, wet, water, soak, dampen, moisturize, bedew

Example Sentences Including 'hydrate'

Someone had slipped a massive overdose of chloral hydrate into the bottle.
Brierley, David Skorpion's Death


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