any of a series of gaseous or low-boiling, inert, nonflammable compounds of fluorine, carbon, and often chlorine: used as refrigerants, solvents, and aerosol propellants
Origin:
f(luorine) + re(frigerant) + -on, as in neon
See Freon in American Heritage Dictionary 4
A trademark used for a variety of nonflammable gaseous or liquid fluorinated hydrocarbons employed primarily as working fluids in refrigeration and air conditioning and as aerosol propellants.