fossil oil fossil mud crack • fossil ore · · · Info · Definitions · Synonyms · Characters · · fossil oil · · Text Common · · Latin · · Scripts 10 · · Length Definitions · · · (noun) a dark oil consisting mainly of hydrocarbons. Synonyms: petroleum, crude oil, crude, rock oil, oil. · · Noun Definition 1 Synonyms · · · dodo · · Synonym 1 fogy · · Synonym 2 fogey · · Synonym 3 fossil · · Synonym 4 Characters · · space U+0020 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