diesel oil diesel-engined • diesel-powered · · · Info · Definitions · Synonyms · Characters · · diesel oil · · Text Common · · Latin · · Scripts 10 · · Length Definitions · · · (noun) a heavy mineral oil used as fuel in diesel engines. Synonyms: diesel fuel. · · Noun Definition 1 Synonyms · · · diesel · · Synonym 1 diesel engine · · Synonym 2 diesel motor · · Synonym 3 Characters · · space U+0020 d latin small letter d U+0064 e latin small letter e U+0065 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