Webster's Revised Unabridged Dictionary · 1913

dehydrate

dehydrate , transitive verb

To deprive of water; to render free from water; as, to dehydrate alcohol; to dehydrate food for preservation.

dehydrate , intransitive verb

1.
to lose water or moisture.
2.
to lose sufficient water to cause physiological distress; -- of living organisms; as, victims trapped in the earthquake rubble may dehydrate if not found quickly.