silicofluoride

from The Collaborative International Dictionary of English v.0.48

Fluosilicate \Flu`o*sil"i*cate\, n. [Cf. F. fluosilicate.]
   (Chem.)
   A double fluoride of silicon and some other (usually basic)
   element or radical, regarded as a salt of fluosilicic acid;
   -- called also {silicofluoride}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Silicofluoride \Sil`i*co*flu"or*ide\, n. (Chem.)
   A fluosilicate; a salt of silicofluoric acid.
   [1913 Webster]