Sentence:  Lion-Peugeot, whose recent successes at Barcelona and in Sicily have made them the favorites for the Boulogne race, will present two single-cylinder cars and one twin-cylinder. The <WSD>one-lungers</WSD> are special productions with a bore of 3.9 inches ... 
Meaning of the word marked with <WSD> tags:  A vehicle whose engine has the specified number of cylinders.