fluosilicate
/ˌfluːəʊˈsɪlɪkət/ /ˌfluːəʊˈsɪlɪkeɪt/noun
A salt of fluosilicic acid.
Origin
Early 19th century; earliest use found in Annals of Philosophy. From fluo- + silicate, probably after German Fluosilicat or its apparent etymon French fluosilicate.