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."
carry dehydrated food on your camping trip
All this exercise and sweating has dehydrated me
In the desert, you get dehydrated very quickly
dehiscence
dehorn
dehortation
dehumanize
dehumidifier
dehydrate
de-ice
deicide
deictic
deific
deification
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