fluoride

noun

fluo·​ride ˈflȯr-ˌīd  ˈflu̇r- 

often attributive

1

: a compound of fluorine

2

: the monovalent anion of fluorine

Examples of fluoride in a Sentence

Recent Examples on the Web

Meyers said the only actual safety issue now being reported is that the powdered fluoride bags recently delivered to the treatment plant by outside contractors sometimes have cuts in the plastic. —Barbara Henry, San Diego Union-Tribune, 22 Jan. 2026

And the National Toxicity Program, which is the ultimate arbiter of the toxicity of environmental exposures, have found that even small exposures to fluoride reduce IQ by a point, a point-and-a-half, and the larger exposures by much more. —Will Carless, USA Today, 22 Jan. 2026

Municipal tap water typically contains certain minerals, such as chlorine and fluoride, that some plants are sensitive to. —Madeline Buiano, Martha Stewart, 17 Jan. 2026

Bekker and others are piecing together ways to provide other forms of fluoride treatment to Utahns. —Anna Clark, CNN Money, 16 Jan. 2026

Word History

First Known Use

1826, in the meaning defined at sense 1

Phrases Containing fluoride

• hydrogen fluoride
• lithium fluoride
• sodium fluoride

Rhymes for fluoride

• abide
• allied
• applied
• aside
• astride
• azide
• backside
• bankside
• bastide
• bayside
• bedside
• belied

Kids Definition

fluoride

noun

flu·​o·​ride

ˈflu̇(-ə)r-ˌīd

: a compound of fluorine with another element or chemical group

Medical Definition

fluoride

noun

flu·​o·​ride ˈflu̇(-ə)r-ˌīd 

1

: a compound of fluorine with a more electropositive element or radical

2

: the monovalent anion of fluorine

fluoride adjective