Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun fluorine

1 sense of fluorine

Sense 1
fluorine, F, atomic number 9 -- (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)
       => chemical element, element -- (any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter)
       => gas -- (a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely)
       => halogen -- (any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions)