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fluorine

noun
🔊/ˈflɔːriːn/, 🔊/ˈflʊəriːn/
🔊/ˈflɔːriːn/, 🔊/ˈflʊriːn/
[uncountable]
(symbol F)
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  1. a chemical element. Fluorine is a poisonous pale yellow gas and is very reactive.氟
    Word Originearly 19th cent.: from fluor ‘a flow, a mineral used as a flux, fluorspar’ (from Latin fluor, from fluere ‘to flow’) + -ine.