fluorin
/ˈflʊrɪn/
noun
- A nonmetallic chemical element, the lightest halogen, that is a pale yellow gas and is highly reactive; used in toothpaste and water fluoridation.
- The chemist carefully handled the fluorin gas because it is very dangerous.
- Fluorin is added to many brands of toothpaste to help prevent cavities.
- Some communities add small amounts of fluorin to their drinking water for dental health.