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[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, CH 3 F.
Origin of fluoride
1820-30; fluor- + -ide
Can be confused Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for fluoride
  • Add a solution of water and fluoride ions, and stir.
  • Same reason they don't do preventive seals, fluoride treatments, or anything else that is routine dental care at private dentists.
  • It was a short-lived effort as the chickens began dying from fluoride poisoning.
  • Its fibrous twigs were laced with fluoride and antiseptics.
  • He was mocked for maintaining that fluoride was not merely a useful chemical, but a nutrient essential to the diet.
  • Thorium-fluoride reactors can operate at atmospheric temperature.
  • The design is based on the lab's finding that thorium dissolves in hot liquid fluoride salts.
  • No, this is not even a little bit similar to liquid fluoride thorium reactors.
  • The author is using the fluoride, cell phone example as if those are proven cases of hyped fear and that is not the case.
  • Unseen is the damage fluoride ingestion causes to bones, thyroid and kidney function.
British Dictionary definitions for fluoride


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
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Word Origin and History for fluoride

1826, "binary compound of fluorine with another element," from fluorine + -ide.

Online Etymology Dictionary, © 2010 Douglas Harper
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fluoride in Medicine

fluoride fluor·ide (flur'īd', flôr'-)

  1. A compound of fluorine with another element.

  2. 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.
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fluoride in Science
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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fluoride in Culture
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 American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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