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fluorine

flu·o·rine

fluorine

 
pronunciation:
flu rin [or] flo rin
features:
Word Combinations (noun), Word Explorer
part of speech: noun
definition: an extremely reactive chemical element of the halogen group that has nine protons in each nucleus and that occurs naturally only in compounds such as fluoride salts, but that can be isolated in pure form as a yellowish, highly toxic gas. (symbol: F)
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  element, tooth