Wiktionary
n. (context inorganic compound English) The salt NaF, used in the fluoridation of water
WordNet
n. a colorless crystalline salt of sodium (NaF) used in fluoridation of water and to prevent tooth decay
Wikipedia
Sodium fluoride is an inorganic chemical compound with the formula NaF. A colorless solid, it is a source of the fluoride ion in diverse applications. Sodium fluoride is less expensive and less hygroscopic than the related salt potassium fluoride.
Usage examples of "sodium fluoride".
Also, the moisture in the air reacts with the cryolite to form sodium fluoride, hydrofluoric acid, and alumina, thus further worsening the ratio.
Calcium Fluoride should not be confused with Sodium Fluoride which is used for fluoridating water supplies.
For drug or alcohol testing one collects blood samples in gray-top tubes with sodium fluoride.