Fluosilicic acid

What is Fluosilicic acid?

Fluosilicic acid definition and meaning on Dictionary terms:
noun Chemistry.

an unstable acid, H2SiF6, known only in its colorless, poisonous, fuming aqueous solution or in the form of its salts: used chiefly as a wood preservative, a disinfectant, and as a hardening agent in the manufacture of ceramic ware, cement, and concrete.