- a combustible petroleum distillate used as fuel for diesel engines.
- a fuel obtained from petroleum distillation that is used in diesel engines. It has a relatively low ignition temperature (540°C) and is ignited by the heat of compressionAlso called (Brit): derv See also cetane number
- A lightweight mixture of liquid hydrocarbons that are derived from petroleum. The hydrocarbons in diesel oil contain between 13 and 25 carbon atoms. Diesel oil is used as a fuel for diesel engines.