- 1(also diesel fuel) [uncountable] a type of heavy oil used as a fuel instead of gas a diesel engine (= one that burns diesel) diesel cars/locomotives/trains compare gas
Definitions on the go
Look up any word in the dictionary offline, anytime, anywhere with the Oxford Advanced Learner’s Dictionary app.
- 2[countable] a vehicle that uses diesel fuel Our new car is a diesel.
Check pronunciation: diesel