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four-stroke engine

fourst·ro·keen·gine

uncommon

noun

1.

an internal-combustion engine in which an explosive mixture is drawn into the cylinder on the first stroke and is compressed and ignited on the second stroke; work is done on the third stroke and the products of combustion are exhausted on the fourth stroke

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WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.