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

Aluminum and rubidium fluoride are introduced during the first stage, with additional RbF added in the final stage to enhance the open-circuit voltage while maintaining high efficiency. —Bojan Stojkovski, Interesting Engineering, 14 Mar. 2026

This is not manufactured, like the DeSantis administration’s obsession with bogus fluoride studies or vaccine conspiracies. —Sun Sentinel Editorial Board, Sun Sentinel, 12 Mar. 2026

To get there, technicians must chemically convert the yellowcake into uranium hexafluoride gas (a molecule containing one uranium atom and six fluorides) and feed it into centrifuges. —Dan Vergano, Scientific American, 11 Mar. 2026

Encouraging your kid to brush their teeth twice a day, with a dab of fluoride toothpaste, will guard against cavities. —Barrie Gillies, Parents, 9 Mar. 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