[floo
r-i-dey-shuhn, flawr-, flohr-] 
| the addition of fluorides to the public water supply to reduce the incidence of tooth decay. |
| fluor·i·da·tion (flŏŏr'ĭ-dā'shən, flôr'-, flōr'-) n. The addition of a fluorine compound to a drinking water supply for the purpose of reducing tooth decay. |
fluoridation fluor·i·da·tion (fl&oobreve;r'ĭ-dā'shən, flôr'-)
n.
The addition of a fluorine compound to drinking water for the purpose of reducing tooth decay.