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]WordNet (r) 3.0 (2006):
fluosilicate n 1: salt of fluosilicic acid