Definition of “dehydrate” - English Dictionary

“dehydrate” in British English

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dehydrateverb [ I or T ]

uk /ˌdiː.haɪˈdreɪt/ us /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.

(Definition of “dehydrate” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“dehydrate” in American English

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dehydrateverb [ I/T ]

us /ˌdiˈhɑɪ·dreɪt/

to lose water, or to cause something to lose water:

[ T ] The vegetables were dehydrated and frozen.
dehydration
noun [ U ] us /ˌdi·hɑɪˈdreɪ·ʃən/

In hot, dry weather you need to drink lots of water to avoid dehydration.

(Definition of “dehydrate” from the Cambridge Academic Content Dictionary © Cambridge University Press)