[fawr-strohk, fohr-]
adjective Machinery.

1895–1900 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Compare two-stroke US and Canadian name: four-cycle relating to or designating an internal-combustion engine in which the piston makes four strokes for every explosion

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
But two-stroke engines tend to spew out more unburned fuel in the exhaust,
  which is why the four-stroke design became more common.
The cycle is then repeated for each four-stroke cycle.
Gas-powered models come in either two-stroke or four-stroke designs.
The new hyphen-filled motor is an air-cooled, fuel-injected three-valve
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