水すい和わ物ぶつすいわぶつMeanings1nounhydrateChemical term for a compound containing water molecules bound in its crystal structure.硫りゅう酸さん銅どう五ご水すい和わ物ぶつは青あお色いろの結けっ晶しょうです。Copper sulfate pentahydrate is a blue crystal.