a reciprocating engine, as a diesel engine, in which each cylinder has two pistons that move simultaneously away from or toward the center.
Read more in this article about some frequently asked questions and fun facts related to our definitions.
Take A Ride Around The World On These Unusual Transports
One way to get to know a country is through its food. Another way is by using the country’s public transportation. Some unique modes of transportation are just for fun, like dog-sledding trips in Norway and zorbing in New Zealand (which involves rolling down a hill inside a giant inflatable ball, just saying). Other means of transportation are more practical . . . here’s a …
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