dehydrate

Concise Oxford English Dictionary © 2008 Oxford University Press:
dehydrate /diːhʌɪˈdreɪt, -ˈhʌɪdreɪt/

▶verb (often as adj. dehydrated) lose or cause to lose a large amount of water.

■ remove water from (food) in order to preserve it.

– derivatives
dehydration noun,
dehydrator noun.

– origin C19: from de- + Gk hudros, hudr- ‘water’.