A trademarked brand name for a type of refrigerant gas, particularly chlorofluorocarbon (CFC) compounds, now largely phased out due to ozone damage.
A proprietary name created by DuPont for their chlorofluorocarbon refrigerants in the 1930s; the origin of the name itself is unclear but was likely a marketing creation.
Freon is a brand name that became so popular it turned into a generic term—people still say 'Freon' for refrigerants even though most Freon is now banned because it destroys the ozone layer, making it a cautionary tale of unintended consequences.
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