IPA: //diˈhaɪdreɪtə//
KK: /diˈhaɪdreɪtər/
A device or machine that removes moisture from food or other materials to preserve them.
We used a dehydrator to make dried fruit snacks for the trip.
Dehydrator → It is formed from "de-" (meaning down or away) and "hydrator" (from "hydra" meaning water and "-ator" meaning one who). The word describes a device that removes water from something.
Think of 'removing water' ('de-' means away and 'hydra' means water) — that's what a dehydrator does.