fioulcommon nounEtymologyexpandTranscription of the English word fuel ('combustible'), itself coming from Old French fouaille (that which feeds the fire).Definitions1. Heavy distillate of petroleum, used as fuel for domestic or industrial heating installations, as fuel for large diesel engines (also called mazout; should be preferred to the English word fuel).expand2. Diesel.flags.CanadaexpandSynonymsfuel oilmazoutPluralfioulsTranslationsenglish:fuel oilSee alsofuel (cn.)