opposed-piston engine

American  

[uh-pohzd-pis-tuhn] / əˈpoʊzdˈpɪs tən /

noun

1. a reciprocating engine, as a diesel engine, in which each cylinder has two pistons that move simultaneously away from or toward the center.

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Etymology

Origin of opposed-piston engine

First recorded in 1965–70

Example Sentences

The Darracq firm also made a four-cylindered horizontal opposed piston engine, in which two revolutions were given to the crankshaft per revolution, at equal angular intervals.

From A History of Aeronautics by Vivian, Evelyn Charles