12 letters · 16 points in Scrabble
noun the addition of a fluoride to the water supply (to prevent dental decay)
originEtymology tree English fluor(ine) Proto-Indo-European *dʰeh₁-der. Proto-Italic *-iðos Latin -idusder. English -ide English fluoride Proto-Indo-European *-tis Proto-Indo-European *-Hō Proto-Indo-European *-tiHō Proto-Italic *-tiō Latin -tiō Latin -ātiōlbor. Old French -ationbor. Middle English -acioun English -ation English fluoridation From fluoride + -ation.
Etymology from Wiktionary, CC BY-SA 3.0