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

But even as critics point to fluoride supplements as an alternative — along with fluoride toothpaste, rinses and varnishes — many are creating barriers to these same products. —Anna Clark, ProPublica, 14 Jan. 2026

Transition metal fluorides are widely regarded as promising cathode materials because of their high theoretical voltages and excellent thermal stability. —Prabhat Ranjan Mishra, Interesting Engineering, 12 Jan. 2026

For instance, during last year’s lesgilative session, lawmakers voted to ban local governments from adding fluoride to water supplies. —Howard Cohen, Miami Herald, 12 Jan. 2026

Water from the tap can contain minerals and chemicals, such as fluoride and chlorine, to which some plants are sensitive. —Samantha Johnson, Martha Stewart, 9 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