Examples from the Web for hydrous
Thus opal is a hydrous form of silica (hydrous comes from the Greek word for water).A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public|Frank Bertram Wade
Autunite, a hydrous phosphate of uranium and calcium, crystallizing in the rhombic system in yellow plates.
Hydrous, Hydruntum, Otranto, has as good a claim as a city can well have to be looked on as the end of the world.Sketches from the Subject and Neighbour Lands of Venice|Edward A. Freeman
Composition, a hydrous silicate of magnesia, much like that of serpentine.Geology|William J. Miller
It is a pseudomorph after iolite, and consists mainly of hydrous aluminium silicate.The New Gresham Encyclopedia|Various