hydrated (Adjective) — (chemistry) containing combined water (especially water of crystallization as in a hydrate).
hydrated (Verb) — Supply water or liquid to in order to maintain a healthy balance. ex. "the bicyclists must be hydrated frequently"
hydrated (Verb) — Become hydrated and combine with water.
hydrated (Verb) — Cause to be hydrated; add water or moisture to. ex. "hydrate your skin"