fluoride
Concise Oxford English Dictionary © 2008 Oxford University Press:
fluoride /ˈflʊərʌɪd, flɔː-/
▶noun
- 1 Chemistry a compound of fluorine with another element or group: calcium fluoride.
- 2 sodium fluoride or another fluorine-containing salt added to water supplies or toothpaste in order to reduce tooth decay.
'fluoride' also found in these Oxford entries:

