jelly (pə-trŌʹlē-əm jĕlʹē) noun. A colorless-to-amber semisolid mixture of hydrocarbons obtained from petroleum and used in lubricants and medicinal ointments. Also called
petroleum (pə-trōʹlē-əm) noun. Abbr. pet. A thick, flammable, yellow-to-black mixture of gaseous, liquid, and solid hydrocarbons that occurs naturally beneath the earth's surface, can be separated into fractions including natural gas, gasoline, naphtha, kerosene, fuel and lubricating oils, paraffin wax, and asphalt and is used as raw material for a wide variety of derivative products, petroleum.