opposed-engine

op·posed-pis·ton en·gine

[uh-pohzd-pis-tuhn]
noun
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 engine.


Origin:
1965–70

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Opposed-engine is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
a stew of meat, vegetables, potatoes, etc.
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