fossil fuel fossiled • fossiliferous · · · Info · Definitions · Characters · · fossil fuel · · Text Common · · Latin · · Scripts 11 · · Length 4 · · Syllables Definitions · · · (noun) fuel consisting of the remains of organisms preserved in rocks in the earth's crust with high carbon and hydrogen content. Synonyms: fossil fuel. · · Noun Definition 1 Characters · · space U+0020 e latin small letter e U+0065 f latin small letter f U+0066 i latin small letter i U+0069 l latin small letter l U+006C o latin small letter o U+006F s latin small letter s U+0073 u latin small letter u U+0075