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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Diesel, Die·sel en·gine or  Die·sel mo·tor.  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.
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From: WordNet (r) 2.0

 diesel motor
      n : an internal-combustion engine that burns heavy oil [syn: diesel,
           diesel engine]