Etymology
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diesel (adj.)

also Diesel, type of internal combustion engine, 1894, named for Rudolf Diesel (1858-1913), German mechanical engineer who designed this type of engine.

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Definitions of diesel
1
diesel (n.)
an internal-combustion engine that burns heavy oil;
Synonyms: diesel engine / diesel motor
2
Diesel (n.)
German engineer (born in France) who invented the diesel engine (1858-1913);
Synonyms: Rudolf Diesel / Rudolf Christian Karl Diesel
From wordnet.princeton.edu