The French use the word chateau for castle but it used to cover both: the Chateau-Gaillard, a fortress of the 12th century; and the manors dating from the 12th to the 18th century, which have no or little defensive capability.he French use the word chateau for castle but it used to cover both: the Chateau-Gaillard, a fortress of the 12th century; and the manors dating from the 12th to the 18th century, which have no or little defensive capability.
Hydrate, any compound containing water in the form of H2O molecules, usually, but not always, with a definite content of water by weight. The best-known hydrates are crystalline solids that lose their fundamental structures upon removal of the bound water.
Definition: Water of hydration is water that is stoichiometrically bound into a crystal. Crystal salts containing water of hydration are called hydrates.Also Known As: water of crystallization, crystallization water. Examples: Commercial root killers often contain copper sulfate pentahydrate (CuSO 4 Â·5H 2 O) cyrstals.efinition: Water of hydration is water that is stoichiometrically bound into a crystal. Crystal salts containing water of hydration are called hydrates. Also Known As: water of crystallization, crystallization water.