Definition of fluoride for English Language Learners. : a chemical that is sometimes added to drinking water and toothpaste to help keep teeth healthy.
Fairfax is an incorporated town in Marin County, California, United States. Fairfax is located 3.25 miles (5.2 km) west-northwest of San Rafael, at an elevation of 115 feet (35 m). The population is 7,441 at the 2010 census. Fairfax is the only town in America that holds a Green Party majority in the town council.
Fairfax County, officially the County of Fairfax, is a county in the Commonwealth of Virginia. As of the 2010 census, the population was 1,081,726, in 2015, it was estimated at 1,142,234, making it the Commonwealth's most populous jurisdiction, with 13.6% of Virginia's population.