hydrochlorofluorocarbon: a fluorocarbon that is replacing chlorofluorocarbon as a refrigerant and propellant in aerosol cans; considered to be somewhat less destructive to the atmosphere
chlorofluorocarbon: a fluorocarbon with chlorine; formerly used as a refrigerant and as a propellant in aerosol cans
post chaise: closed horse-drawn carriage with four wheels; formerly used to transport passengers and mail