WordReference Random House Learner's Dictionary of American English © 2015
fluor•i•date /ˈflʊrɪˌdeɪt/USA pronunciation   v. [+ object],-dat•ed, -dat•ing. 
  1. Chemistryto add fluorides to (a water supply) to reduce tooth decay.
fluor•i•da•tion, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2015
fluor•i•date  (flŏŏri dāt′, flôr-, flōr-), 
v.t., -dat•ed, -dat•ing. 
  1. Chemistryto introduce a fluoride into:to fluoridate drinking water.
  • back formation from fluoridation 1945–50

Collins Concise English Dictionary © HarperCollins Publishers::

fluoridate /ˈflʊərɪˌdeɪt/ vb
  1. to subject (water) to fluoridation

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