opposed-piston engine
[uh-pohzd-pis-tuh n]
noun
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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Origin of opposed-piston engine
First recorded in 1965–70
Also called opposed engine.
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019