Definition of fluoride noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈflɔːraɪd//
; NAmE NAmE//ˈflɔːraɪd//
; BrE also BrE//ˈflʊəraɪd//
; NAmE also NAmE//ˈflʊraɪd//
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a chemical containing fluorine that protects teeth from decay and is often added to toothpaste and sometimes to drinking water Word Originearly 19th cent.: from fluorine + -ide.
See the Oxford Advanced American Dictionary entry: fluoride