[ floo r-ahyd, flawr-, flohr- ]
/ ˈflʊər aɪd, ˈflɔr-, ˈfloʊr- /

noun Chemistry.

a salt of hydrofluoric acid consisting of two elements, one of which is fluorine, as sodium fluoride, NaF.
a compound containing fluorine, as methyl fluoride, CH3F.

Origin of fluoride

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


fluorescent fluoridation fluoride
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for fluoride

British Dictionary definitions for fluoride

/ (ˈflʊəˌraɪd) /


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

Medicine definitions for fluoride

[ flurīd′, flôr- ]


A compound of fluorine with another element.
The univalent anion of fluorine.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for fluoride

[ flurīd′ ]

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.

Culture 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.