Adjective
Containing water; watery.
Containing water of hydration or crystallization.
Source: Webster's dictionaryISBN 2-7011-1756-9 because the boiling-range temperatures produced in especially hydrous foods impede flavors produced by the higher temperatures of frying, browning, or baking. Source: Internet
Lapis lazuli is commercially synthesized or simulated by the Gilson process, which is used to make artificial ultramarine and hydrous zinc phosphates. Source: Internet