fluo·​rine | \ ˈflu̇r-ˌēn How to pronounce fluorine (audio) , ˈflȯr- \

Definition of fluorine

: 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 Signals from fluoride ions, along with their corresponding atom fluorine, are too weak to detect with standard portable equipment. Lakshmi Supriya, Scientific American, "Volcanic Ash Threatens Pompeii’s Buried Murals," 26 Mar. 2021 The signature feature of PFAS is the super-tight bond between fluorine and carbon, considered one of the tightest in nature. Jennifer Bjorhus, Star Tribune, "Landfills are leaking PFAS 'forever chemicals' in 41 Minnesota counties," 18 Mar. 2021 The class of thousands of chemicals -- used to make products nonstick, waterproof or stain-resistant -- involve variations of carbon-fluorine bonds that didn’t exist in nature before companies like 3M Co., DuPont and Solvay started making them. Tiffany Kary, Bloomberg.com, "Bill Gates-Backed Venture Aims to Eliminate ‘Forever Chemicals’," 22 Oct. 2020 The best choices rely on the fewest chemicals, such as fluorine, that might leach into your food or the environment after they’re used. Tom Sietsema, Washington Post, "All my takeout has delivered a mountain of trash. So I asked experts how to minimize it.," 14 Sep. 2020 The improved stability is owed to an electrolyte composed of two lithium-boron-fluorine salts in an organic solvent. Scott K. Johnson, Ars Technica, "Tesla research partnership progresses on new battery chemistry," 14 Aug. 2020 Cardboard boxes for McNuggets or fries also had low or undetectable fluorine levels. Michele Cohen Marill, Wired, "The End Is Nearer for ‘Forever Chemicals’ in Food Wrappers," 7 Aug. 2020 One major hit was HFO, a new form of fluorine for industrial refrigeration. Shawn Tully, Fortune, "Former Honeywell CEO David Cote just wrote one of the best guides ever on how to lead a company," 25 June 2020 Coating the electrode with a water-repellent, fluorine-rich polymer can help. Robert F. Service, Science | AAAS, "Making commodity chemicals requires fossil fuels. New devices could do it with renewables," 4 May 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'fluorine.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of fluorine

1813, in the meaning defined above

History and Etymology for fluorine

French, from New Latin fluor

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Time Traveler for fluorine

Time Traveler

The first known use of fluorine was in 1813

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Statistics for fluorine

Last Updated

3 Apr 2021

Cite this Entry

“Fluorine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fluorine. Accessed 15 May. 2021.

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More Definitions for fluorine


fluo·​rine | \ ˈflu̇r-ˌēn How to pronounce fluorine (audio) , ˈflȯr- \

Kids Definition of fluorine

: a yellowish flammable irritating gaseous chemical element


fluo·​rine | \ ˈflu̇(-ə)r-ˌēn How to pronounce fluorine (audio) , -ən How to pronounce fluorine (audio) \

Medical Definition of fluorine

: 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

Nglish: Translation of fluorine for Spanish Speakers

Britannica.com: Encyclopedia article about fluorine

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