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

This gives the fluoride extra time to do its job and provide better protection against decay. — Maggie Ryan, Flow Space, 23 July 2026

Municipal tap water typically contains certain additives, such as chlorine and fluoride, that some plants are sensitive to. — Madeline Buiano, Martha Stewart, 21 July 2026

The companies will now work together to create and commercialize FLiBe, a molten salt made from lithium fluoride (LiF) and beryllium fluoride (BeF2). — Georgina Jedikovska, Interesting Engineering, 16 July 2026

To get the most benefit from fluoride toothpaste, avoid rinsing your mouth with water afterward. — Sarah Jividen, Verywell Health, 10 July 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