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The Collaborative International Dictionary of English v.0.48:

Fluosilicic \Flu`o*si*lic"ic\, a. [Fluo- + silicic: cf. F. fluosilicique.] (Chem.) Composed of, or derived from, silicon and fluorine. [1913 Webster] Fluosilicic acid, a double fluoride of hydrogen and silicon, H2F6Si, obtained in solution in water as a sour fuming liquid, and regarded as the type of the fluosilicates; -- called also silicofluoric acid, and hydrofluosilicic acid. [1913 Webster]