noun🔗ShareA solid disk or cylinder that fits inside a hollow cylinder, and moves under pressure (as in an engine) or displaces fluid (as in a pump)"The car's engine used a piston to compress the air and create power. "machinetechnicalpartdeviceenergyChat with AIVocabulary GamePractice Reading
noun🔗ShareA valve device in some brass instruments for changing the pitch"The brass band's music teacher showed the students how to use the piston valves to play different notes. "musicdevicetechnicalmachineChat with AIVocabulary GamePractice Reading
verb🔗ShareTo move up and down like a piston."The elevator pistoned up and down, carrying the workers to the different floors. "machinetechnicalactionChat with AIVocabulary GamePractice Reading
