a toxic pungent pale yellow gas of the halogen group that is the most electronegative and reactive of all the elements, occurring principally in fluorspar and cryolite: used in the production of uranium, fluorocarbons, and other chemicals. Symbol: F; atomic no: 9; atomic wt: 18.9984032; valency: 1; density: 1.696 kg/m3; relative density: 1.108; freezing pt: –219.62°C; boiling pt: –188.13°C
WordReference Random House Learner's Dictionary of American English © 2025
fluor•ine /ˈflʊrin, -ɪn, ˈflɔr-/USA pronunciation
n. [uncountable]
WordReference Random House Unabridged Dictionary of American English © 2025- Chemistry, Nutritionan element occurring as a pale yellow, poisonous gas.
fluor•ine
(flŏŏr′ēn, -in, flôr′-, flōr′-),USA pronunciation n. [Chem.]
- Chemistry, Nutritionthe most reactive nonmetallic element, a pale-yellow, corrosive, toxic gas that occurs combined, esp. in fluorite, cryolite, phosphate rock, and other minerals. Symbol: F;
at. wt.: 18.9984;
at. no.: 9.
- fluor(ic) + -ine1 1805–15
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'fluorine' also found in these entries (note: many are not synonyms or translations):
F
- F, f
- chlorofluorocarbon
- chlorofluoromethane
- fluor-
- fluoric
- fluoride
- fluorinate
- fluorine dating
- fluorite
- fluoro-
- fluorocarbon
- fluorophosphoric acid
- fluoroplastic
- fluorspar
- halogen
- halon
- hexafluoride
- hydrogen bond
- microlite
- morphactin
- stannous fluoride
- tetrafluoride
- trifluoride
- xenon tetrafluoride