fluorine

noun

fluo·​rine ˈflu̇r-ˌēn 

ˈflȯr-

: 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

First, the presence of abundant fluorine atoms leads to strong intermolecular interactions with beta-blocker molecules. —Neetika Walter, Interesting Engineering, 15 Oct. 2025

Scientists discovered that these surfaces could be fine-tuned with oxygen, hydroxyl, or fluorine, giving them a way to adjust Mxene behavior for different tasks. —Chelsea Haney october 11, New Atlas, 11 Oct. 2025

The outer barrel is a sturdy polycarbonate, and the lens includes dust and splash protection, along with anti-smudge fluorine on its front glass. —PC Magazine, 23 Sep. 2025

These materials include aluminum, cobalt, copper, dysprosium, electrical steel, fluorine, gallium, iridium, lithium, magnesium, graphite, neodymium, nickel, platinum, praseodymium, silicon, silicon carbide and terbium. —Sahit Muja, Forbes.com, 3 Sep. 2025

Word History

Etymology

French, from New Latin fluor

First Known Use

1813, in the meaning defined above

Rhymes for fluorine

• agin
• alkene
• allene
• ameen
• amin
• amine
• arene
• athene
• baleen
• beeline
• benzene
• between

Kids Definition

fluorine

noun

flu·​o·​rine

ˈflu̇(-ə)r-ˌēn,

-ən

: 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

fluorine

noun

fluo·​rine ˈflu̇(-ə)r-ˌēn  -ən 

: a nonmetallic monovalent halogen element that is normally a pale yellowish flammable irritating toxic gas

—symbol F see Chemical Elements Table