die ‧ sel /ˈdiːz ə l/ BrE AmE noun
[ Date: 1800-1900 ; Origin: Rudolph Diesel (1858-1913), German engineer who invented the engine ]
1 . [uncountable] a type of heavy oil used instead of petrol in engines, especially in trucks, buses, and trains:
a 1.9 litre diesel engine
diesel car/truck etc
2 . [countable] informal a vehicle that uses diesel