Pronunciation enPR: dē'zəl, IPA (key): /ˈdiːzəl/ (US) IPA (key): /ˈdisəl/ or /ˈdizəl/ Audio (AU)(file) Noun Singular diesel Plural diesels Diesel is a type of fuel made from oil. A diesel is a vehicle or engine that uses diesel fuel.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads