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opposed-cylinder engine

op·posed-cyl·in·der en·gine (plural op·posed-cyl·in·der en·gines)


noun 
Definition:
 
kind of internal-combustion engine: an engine in which cylinders or banks of cylinders are mounted on opposite sides of the crankcase in the same plane, with their connecting rods mounted on a common crankshaft. Piston strokes on each side of the camshaft work in a direction opposite to one another.

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