definition fossil fuels
Full Definition of FOSSIL FUEL. : a fuel (as coal, oil, or natural gas) formed in the earth from plant or animal remains. â fosÂ·silâfueled \-Ëfyue(-ËfyÃ¼)É\ ld. Adjective see fossil fuel defined For-english language. Learners see fossil fuel defined for. kids a fuel (as coal, oil, or natural gas) formed in the earth from plant or animal remains. â fosÂ·silâfueled \-Ëfyue(-ËfyÃ¼)É\ ld. Adjective see fossil fuel defined For-english language. Learners see fossil fuel defined for. kids