Definition of fluorine in English:

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Pronunciation: /ˈflʊəriːn/
Pronunciation: /ˈflɔːriːn/


[mass noun]
The chemical element of atomic number 9, a poisonous pale yellow gas of the halogen series. It is the most reactive of all the elements, causing very severe burns on contact with skin. (Symbol: F)
Example sentences
  • The elements hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine and iodine consist of diatomic molecules.
  • The halogens are a group of chemical elements that includes fluorine, chlorine, bromine, iodine, and astatine.
  • Potassium also reacts readily with all acids and with many nonmetals, such as sulfur, fluorine, chlorine, phosphorus, and nitrogen.


Early 19th century: from fluor (see fluorspar) + -ine4.

For editors and proofreaders

Line breaks: fluor|ine

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