[ floor-ahyd, flawr-, flohr- ]

  1. a salt of hydrofluoric acid consisting of two elements, one of which is fluorine, as sodium fluoride, NaF.

  2. a compound containing fluorine, as methyl fluoride, CH3F.

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Origin of fluoride

First recorded in 1820–30; fluor- + -ide

Words that may be confused with fluoride

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use fluoride in a sentence

British Dictionary definitions for fluoride


/ (ˈflʊəˌraɪd) /

  1. any salt of hydrofluoric acid, containing the fluoride ion, F

  2. any compound containing fluorine, such as methyl fluoride

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for fluoride


[ flurīd′ ]

  1. A compound containing fluorine and another element or radical. Fluorine combines readily with nearly all the other elements, except the noble gases, to form fluorides. In some countries, fluoride is added to the drinking water as a preventive measure against tooth decay.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Cultural definitions for fluoride


[ (floor-eyed, flawr-eyed) ]

Any of a number of naturally occurring compounds of the element fluorine. Fluorides have been found to be effective in preventing tooth decay and are routinely added to drinking water in most jurisdictions.

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.