diesel engine

Short definition from Wiktionary

Noun

1. 1
   An internal combustion engine of piston engine type that operates using the Diesel cycle, with diesel fuel being sprayed into the hot, high-pressure air in the combustion chamber at the end of the compression stroke.
2. 2
   An internal combustion engine of piston engine type that operates using the Diesel cycle, with diesel fuel being sprayed into the hot, high-pressure air in the combustion chamber at the end of the compression stroke: Such an engine that burns diesel (diesel fuel).
3. 3
   a diesel locomotive.