fluo·​rine ˈflu̇r-ˌēn How to pronounce fluorine (audio)
: a nonmetallic gaseous chemical element of the halogen group with atomic number 9 that readily forms compounds with almost all other elements including some noble gases see Chemical Elements Table

Examples of fluorine in a Sentence

Recent Examples on the Web Otherwise, the front glass has an anti-smudge fluorine coating. PCMAG, 1 Feb. 2024 In short, f-phenibut is simply Phenibut that has been chemically altered to include a fluorine atom. The Salt Lake Tribune, 16 Aug. 2023 The chemicals — which create an incredibly strong carbon and fluorine bond — have historically been used in firefighting foams, water-resistant products, and Teflon nonstick pans. Yessenia Funes, Discover Magazine, 9 Dec. 2023 The next step will be to recognize which specific PFAS are in each of the products that tested positive for fluorine. Kaitlin Sullivan, Health, 23 Aug. 2023 First, the team tested for the presence of organic fluorine, a compound that indicates the presence of PFAS. Kaitlin Sullivan, Health, 23 Aug. 2023 Eggs are often fortified, with some brands adding fluorine, iodine, manganese, selenium, B vitamins, vitamin E, and certain fatty acids. Christina Manian, Rdn, Better Homes & Gardens, 13 Aug. 2023 Then fluorine atoms fell off as well, abandoning their carbon companions to form fluoride, a safe form of fluorine. Manasee Wagh, Popular Mechanics, 22 Aug. 2022 This isn't really the case as almost all volcanic ash as some fluorine. Erik Klemetti, Discover Magazine, 9 Aug. 2012 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'fluorine.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


French, from New Latin fluor

First Known Use

1813, in the meaning defined above

Time Traveler
The first known use of fluorine was in 1813

Dictionary Entries Near fluorine

Cite this Entry

“Fluorine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fluorine. Accessed 1 Mar. 2024.

Kids Definition


: a nonmetallic element that is normally found alone as a pale yellowish flammable irritating poisonous gas having two atoms per molecule see element

Medical Definition


: a nonmetallic monovalent halogen element that is normally a pale yellowish flammable irritating toxic gas
symbol F
see Chemical Elements Table

More from Merriam-Webster on fluorine

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