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semi-diesel
semi-diesel adj. 
/ˈsɛˌmaɪˌdis(ə)l/, /ˈsɛmiˌdiz(ə)l/, /ˈsɛmiˌdis(ə)l/ (also semi-Diesel) of an engine: (see quot. 1974); also as n., an engine of this type.
Brit. /ˈsɛmɪˌdiːzl/
, /ˈsɛmɪˌdiːzl/U.S. /ˈsɛˌmaɪˌdiz(ə)l/
, /ˈsɛˌmaɪˌdiz(ə)l//ˈsɛˌmaɪˌdis(ə)l//ˈsɛmiˌdiz(ə)l//ˈsɛmiˌdis(ə)l/ΚΠ
1911 Engineer 7 June 27/1 (caption) Semi-Diesel oil engine.
1920 R. A. McMillan Guide to B.O.T. Exam. for Extra First-Class Engineers xv. 396 A common type of Semi-Diesel is the Bolinder engine.
1960 G. Blanchet Search in North i. 19 From the engine exhaust came the hollow staccato of the semi-diesel.
1974 McGraw-Hill Dict. Sci. & Techn. Terms 1323/2 Semidiesel engine. 1. An internal combustion engine of a type resembling the diesel engine in using heavy oil as fuel but employing a lower compression pressure and spraying it under pressure, against a hot (uncooled) surface or spot, or igniting it by the precombustion or supercompression of a portion of the charge in a separate member or uncooled portion of the combustion chamber. 2. A true diesel engine that uses a means other than compressed air for fuel injection.
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