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

Tidmarsh’s ouster is the latest in a string of haphazard leadership changes at the agency, which has been rocked for months by firings, departures and controversial decisions on vaccines, fluoride and other products. —CNN Money, 3 Nov. 2025

Another controversial study, finalized this year, suggested that high levels of fluoride lower the IQ of children. —ArsTechnica, 23 Oct. 2025

On the far east side of Michigan, the future of fluoride in drinking water — long an ordinary practice for preventing tooth decay — has suddenly provoked passionate debate. —Anna Clark, ProPublica, 13 Oct. 2025

Controversial topics addressed: Some of Kennedy’s hot-button topics regarding vaccines and fluoride were also mentioned. —Nicole Fallert, USA Today, 10 Sep. 2025

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