Is it farther or further?
1854, from de- + hydrate (v.). A chemical term at first, given a broader extension 1880s. Related: Dehydration (1834).
dehydrate (dē-hī'drāt')v. de·hy·drat·ed, de·hy·drat·ing, de·hy·drates
To remove water from; make anhydrous.
To preserve by removing water from something, such as vegetables.
To deplete the bodily fluids of an individual.