1. fluorine

noun. (ˈflʊˌriːn, ˈflɔˌriːn) A nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite.
Synonyms
halogen chemical element cryolite fluorspar gas atomic number 9 fluor Greenland spar element F fluorite fluorapatite
Antonyms
understate unleaded gasoline leaded gasoline defend software
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