flu′o•si•lic′ic ac′id(flo̅o̅′ō si lis′ik, flo̅o̅′-),USA pronunciation[Chem.]
Chemistryan 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.