any compound that contains water of crystallization cause to be hydrated; add water or moisture to; "hydrate your skin" become hydrated and combine with water supply water or liquid to in order to maintain a healthy balance; "the bicyclists must be hydrated frequently
A compound involving water Clay is hydrate because there is water chemically combined in its crystals
A compound formed by the union of molecules of water with other molecules or atoms Under certain conditions, natural gas may unite chemically with free water to form hydrates, a solid compound resembling packed snow, at temperatures above the freezing point of water