Etymology
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dehydrate (v.)

1854, transitive, "deprive of or free from water," from de- + hydrate (v.). A chemical term at first, given a broader extension 1880s. Intransitive sense of "to lose water" is by 1886. Related: Dehydrated; dehydrating. Dehydration is attested from 1834 as "removal of water."

updated on July 12, 2018

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Definitions of dehydrate from WordNet

dehydrate (v.)
preserve by removing all water and liquids from;
carry dehydrated food on your camping trip
Synonyms: desiccate
dehydrate (v.)
remove water from;
All this exercise and sweating has dehydrated me
Synonyms: desiccate
dehydrate (v.)
lose water or moisture;
In the desert, you get dehydrated very quickly
Synonyms: exsiccate / dry up / desiccate
From wordnet.princeton.edu, not affiliated with etymonline.