adjective
( technical ) ( of an engine or vehicle ) with a piston that makes four up and down movements in each power cycle
—compare two-stroke
adjective
( technical ) ( of an engine or vehicle ) with a piston that makes four up and down movements in each power cycle
—compare two-stroke
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005