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 is the most populous locality in Virginia, with over one million residents, although that does not include its county seat Fairfax, which is one of the independent cities. Fairfax County has a major urban business and shopping center in Tysons Corner, Virginia's largest office market.