Having four cylinders, either working together or each one working separately from the others.
The Century Dictionary (Public Domain)
Use "four-cylinder" in a sentence
"A teenager was walking on Union Street, West Ryde, at about 12.30am AEST when two men in a red sedan - described as a four-cylinder Honda or Toyota - demanded money from him"
"Its modern, turbocharged four-cylinder engine has an annoying, old-fashioned problem called turbo lag."
"Fiat's share of the company rose to 25% in January when it met the first government benchmark by making a fuel-efficient four-cylinder engine at a factory in Dundee, Mich."