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piston engine▼◼◼◼(engines having cylinders containing reciprocating pistons)noun[UK: ˈpɪ.stən ˈen.dʒɪn] [US: ˈpɪ.stən ˈen.dʒən]
internal combustion engine▼◼◼◼(a piston or a rotary heat engine)noun
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