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
velociraptor: small active carnivore that probably fed on protoceratops; possibly related more closely to birds than to other dinosaurs