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....
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....
OriginEarly 19th century: from fluorine + -ide. |
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