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

Tap water can contain dissolved minerals and treatment additives, such as fluoride and chlorine, that some plants are sensitive to. — Samantha Johnson, Martha Stewart, 4 Sep. 2026

Scientists found that moving fluoride ions helps a solid electrolyte move lithium faster, reaching record conductivity. — Neetika Walter, Interesting Engineering, 2 Sep. 2026

Witness the Cold War speculation in the 1950s that adding fluoride to drinking water was, alternatively, a Communist plot or a CIA mind-control experiment. — Susan Page, USA Today, 1 Sep. 2026

After 15 years of experiments, Schumm’s group ended up with a recipe for solid calcium fluoride crystals, doped with little impurities of thorium 229, that looked like transparent millimeter-sized cubes. — Jacek Krywko, Scientific American, 20 Aug. 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