[floor-ahyd, flawr-, flohr-]
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.

1820–30; fluor- + -ide

fluorescent, fluoridation, fluoride.
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World English Dictionary
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 10th Edition
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Word Origin & History

1826, "binary compound of fluorine with another element," from the same source as fluorine (q.v.). Fluoridation, in reference to adding traces of fluorine to drinking water as a public health policy, dates from 1949.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
fluoride   (flr'īd')  Pronunciation Key 
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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American Heritage
Cultural Dictionary
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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Example sentences
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.
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