fluoride

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fluor·ide / ˈfloŏrˌīd; ˈflôr-/ • n. Chem. a compound of fluorine with another element or group, esp. a salt of the anion F− or an organic compound with fluorine bonded to an alkyl group. ∎  sodium fluoride or another fluorine-containing salt added to water supplies or toothpaste in order to reduce tooth decay.

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