Definition of "diesel"

diesel

/ˈdiːzəl/

noun
countable and uncountable, plural diesels
1. 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.
2. (countable) A vehicle powered by a diesel engine.
  Quotations
  Their effective service life was cut short by an almost simultaneous switch to diesels - a circumstance shared with many an engine north of the border.
  1959, Steam's Finest Hour, edited by David P. Morgan, Kalmbach Publishing Co., referring to Mexico's last new steam locomotives.
  Thumbed a diesel down, outside a cafe.
  1980, Kye Fleming and Fred Foster, ""Smoky Mountain Rain"
3. (cycling, slang) A rider who has an even energy output, without bursts of speed.
4. (UK, slang) Synonym of snakebite and black.
5. (slang) A particular cannabis hybrid.
verb
third-person singular simple present diesels, present participle dieseling, simple past and past participle dieseled
1. To ignite a substance by using the heat generated by compression.
2. (automotive) For a spark-ignition internal combustion engine to continue running after the electrical current to the spark plugs has been turned off. This occurs when there's enough heat in the combustion chamber to ignite the air and fuel mixture without a spark, the same way that heat and pressure cause ignition in a diesel engine.