Relating to or denoting fluosilicic acid, a compound of fluorine, silicon, and hydrogen used in water fluoridation and metal treatment.
From 'fluosilicate' plus '-ic' (chemical suffix), describing the acidic form of fluorine-silicon compounds discovered in 19th-century chemistry.
Fluosilicic acid is the form most often used to fluoridate drinking water because it dissolves easily, doesn't corrode pipes, and was discovered to be both effective and cheap—basically the Goldilocks solution for public health.
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