HYDRATION • E-FREE TRANSLATION.COM • Definition of Hydration

... absorbed mechanically, but actually enters into the composition of the mineral. It is not present as moisture merely, capable of being expelled at ordinary boiling temperature, but it forms what is known as water of composition. In this process of hydration, the mineral loses its lustre and crystalline appearance, crumbles away into a more or less—according to its state of disintegration—powdery mass. A very great change is also effected in its chemical ...

— Manures and the principles of manuring • Charles Morton Aikman

... tincture be evaporated a resinous residue remains that has not been studied, but appears to be the vesicant principle. This tincture should be made from the dried leaves to avoid hydration of the ether. ...

— The Medicinal Plants of the Philippines • T. H. Pardo de Tavera