A heavy mineral oil used as fuel in diesel engines WordNet 3.0 & Open English WordNet

Diesel fuel, also called diesel oil or historically heavy oil, is any liquid fuel specifically designed for use in a diesel engine, a type of internal combustion engine in which fuel ignition takes place without a spark as a result of compression of the inlet air and then injection of fuel. Wikipedia

A liquid fuel used in diesel engines Wikipedia Disambiguation

Liquid fuel used in diesel engines Wikidata

Heavy oil residue used as fuel for certain types of diesel engines. OmegaWiki

A fuel derived from petroleum (or other oils) but heavier than gasoline/petrol. Used to power diesel engines which burn this fuel using the heat produced when air is compressed. Wiktionary

Fuel. Wiktionary (translation)