'four-stroke internal-combustion engine' definitions:

Definition of 'four-stroke internal-combustion engine'

From: WordNet
noun
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 [syn: four-stroke engine, four-stroke internal-combustion engine]