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Dictionary

op•posed'-pis'ton en"gine

Pronunciation: (u-pōzd'pis'tun), [key]
a reciprocating engine, as a diesel engine, in which each cylinder has two pistons that move simultaneously away from or toward the center. Also called opposed' en"gine.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

oppose

opposeless

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