#fluorocarbon  a halocarbon in which some hydrogen atoms have been replaced by fluorine; used in refrigerators and aerosols
  supertype:  halocarbon  one of various compounds of carbon and any of the halogens
  subtype:  chlorofluorocarbon__CFC  a fluorocarbon with chlorine; formerly used as a refrigerant and as a propellant in aerosol cans; "CFCs cause depletion of atmospheric ozone"
  subtype:  tetrafluoroethylene  a flammable gaseous fluorocarbon used in making plastics (polytetrafluoroethylene resins)

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