Flu·o·si·lic·ic a. Chem. Composed of, or derived from, silicon and fluorine.
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.
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