1. a type of fuel oil used in diesel engines
2. a vehicle or engine that runs on diesel fuel

1. powered by or relating to diesel fuel

Examples

• The truck runs on diesel instead of gasoline.
• Diesel is more fuel-efficient than regular gas.
• The mechanic filled the tank with diesel fuel.
• My father drives a diesel pickup truck.
• The diesel engine is louder than a gas engine.
• Diesel prices have increased this month.
• The bus has a powerful diesel motor.