fluoridatePronunciation: /ˈflʊərɪdeɪt, ˈflɔː-/Definition of fluoridate verb [with object] add traces of fluorides to (something): (as adjective fluoridated)fluoridated toothpasteDerivatives fluoridation noun Origin: 1940s: back-formation from earlier fluoridationfluoridate in other Oxford dictionaries Definition of fluoridate in the US English dictionary