This is a French word; means "castle." Its plural is chéteaux. In Spanish it comes from the Latin "castellum" which means : fortress . According to the larrousse dictionary. fr, is also a superstructure in the center of a ship through which it can be transited; in the nuclear industry this word refers to an armored container for transporting radioactive substances. https: //www . Larousse. fr/dictionnaires/francais/chéteau/14902?q-chateau 14775 .