Definitions

1. noun

a salt of hydrofluoric acid, esp. sodium fluoride or stannous fluoride, used as a toothpaste ingredient to prevent tooth decay and strengthen teeth

“The dentist recommended using fluoride toothpaste to prevent cavities.”

2. noun

a compound containing fluorine, often used in the manufacture of plastics, glass, and ceramics

“The company developed a new process for producing fluoride-based materials.”

3. verb

to add fluoride to (water) in order to prevent tooth decay

“The city decided to fluoridate its public water supply to promote oral health.”