any of various nontoxic, nonflammable halocarbon organic compounds containing carbon, fluorine, chlorine, and hydrogen, used for plastic foam, as a refrigerant, etc.: these compounds are thought to damage the atmosphere
See chlorofluorocarbon in American Heritage Dictionary 4
Any of various halocarbon compounds consisting of carbon, hydrogen, chlorine, and fluorine, once used widely as aerosol propellants and refrigerants. Chlorofluorocarbons are believed to cause depletion of the atmospheric ozone layer.