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

 

fluorine

 noun
noun
BrE BrE//ˈflɔːriːn//
 
; NAmE NAmE//ˈflɔːriːn//
 
; BrE also BrE//ˈflʊəriːn//
 
; NAmE also NAmE//ˈflʊriːn//
 
[uncountable](symbol F)
 
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a chemical element. Fluorine is a poisonous pale yellow gas and is very reactive. Word Origin early 19th cent.: from fluor ‘a flow, a mineral used as a flux, fluorspar’ (from Latin fluor, from fluere ‘to flow’) + -ine.
See the Oxford Advanced American Dictionary entry: fluorine