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The Collaborative International Dictionary of English v.0.48 (gcide)

Diesel \Diesel\, Diesel engine \Die"sel en`gine\ or Diesel motor
\Die"sel mo`tor\ (d[=e]"zel). [After Dr. Rudolf Diesel, of
Munich, the inventor.]
A type of internal-combustion engine in which the air drawn
in by the suction stroke is so highly compressed that the
heat generated ignites the fuel (usually a heavy oil), the
fuel being automatically sprayed into the cylinder under
pressure. The Diesel engine has a very high thermal
efficiency.
[Webster 1913 Suppl.]