单词	fluoride
释义	fluoride /ˈflʊərʌɪd / /ˈflɔːrʌɪd/ noun 1 Chemistry A compound of fluorine with another element or group, especially salt of the anion F− or an organic compound with fluorine bonded to an alkyl group.Highly substituted alkyl fluorides, perfluoroalkanes, are now used as artificial blood substitutes because of their oxygen transporting properties.... What Sanpaolesi had aimed to do was to consolidate the deteriorated surface of the marble by forming a layer of calcium, zinc and magnesium fluorides and silica gel on the marble surface. Many elements form fluorides, however, that cannot be labeled covalent or ionic; these halides exhibit the characteristics of polymeric compounds. 2 [mass noun] Sodium fluoride or another fluorine-containing salt added to water supplies or toothpaste in order to reduce tooth decay.Like all the other dentists, Lester had learnt in dental school that fluoride reduces tooth decay.... There is overwhelming evidence that fluoride can substantially reduce tooth decay. Use fluoride toothpaste as fluoride makes teeth stronger and more resistant to acid attacks. Origin Early 19th century: from fluorine + -ide.
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