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 isn’t caused by too little water or too much sun, but rather by the chemicals in tap water, such as fluoride and chlorine. —Karen Brewer Grossman, Southern Living, 5 Apr. 2026

Many public health experts say there is no adequate replacement for fluoride in drinking water. —Aria Bendix, NBC news, 27 Mar. 2026

This fluoride-free toothpaste contains nano-hydroxyapatite, a mineral form of the same ingredient that makes up 97% of tooth enamel and 70% of dentin. —Bestreviews, Mercury News, 26 Mar. 2026

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

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