flu·o·ri·da·tion \ˌflu̇rəˈdāshən, ˌflōr-, ˌflȯr-\noun (-s) Etymology:fluoride + -ation : the addition of fluorine usually as a fluoride to something: as a.: the introduction of fluorine into rocks as indicated by the formation of such minerals as fluorite and topaz b.: the adding of a fluoride to drinking water < fluoridation of public water supplies for prevention of tooth decay in children >