diesel engine definition by American Heritage Dictionary
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
An internal-combustion engine that uses the heat of highly compressed air to ignite a spray of fuel introduced after the start of the compression stroke.
Origin: After Rudolf Diesel.
cycles of a four-stroke diesel engineA. intake stroke B. compression stroke C. power stroke D. exhaust stroke
diesel engine - Science Definition
An internal-combustion engine in which the fuel oil is ignited by the heat of air that has been highly compressed in the cylinder, rather than by a spark. Due to the need for the engine to withstand very high pressures, diesel engines are relatively heavy; however, they are relatively fuel-efficient, especially when running at low power.
Variant of diesel
- a type of internal-combustion engine that burns fuel oil: the ignition is brought about by heat resulting from air compression, instead of by an electric spark as in a gasoline engine
- a locomotive, truck, etc. powered by such an engine
Origin: after R. Diesel (1858-1913), German inventor
to continue to run after the ignition is turned off: said of an internal-combustion engine