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English definition of “dehydrate”

dehydrate

verb [I or T]     /ˌdiː.haɪˈdreɪt/
to lose water, or to cause water to be lost from something, especially from a person's body: Air travel dehydrates the body. You'll dehydrate very quickly in this heat if you don't drink lots of water.Dry weather, arid conditions and dryness
(Definition of dehydrate verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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