Noun | 1. | derv - diesel oil used in cars and lorries with diesel engines; from d(iesel) e(ngine) r(oad) v(ehicle) Britain, Great Britain, U.K., UK, United Kingdom, United Kingdom of Great Britain and Northern Ireland - a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom diesel fuel, diesel oil - a heavy mineral oil used as fuel in diesel engines |