化か石せき燃ねん料りょうかせきねんりょうMeanings1nounfossil fuelRefers to fuels formed from ancient organic matter, such as coal, oil, and natural gas. Common in environmental and energy contexts.化か石せき燃ねん料りょうの使し用ようを減へらす必ひつ要ようがある。We need to reduce the use of fossil fuels.
