I. ˈdēzəl, -ēsəl adjective
Usage: sometimes capitalized
Etymology: after Rudolf Diesel died 1913 German mechanical engineer and inventor
1. : relating to the diesel cycle or engine
2. : equipped with or driven by a diesel engine
a diesel truck
II. noun
Usage: sometimes capitalized
1. : diesel engine
2. : a vehicle (as a truck, locomotive, or ship) driven by a diesel engine