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 engine uses pistons to convert the fuel's energy into movement. "machinetechnicalpartdeviceChat with AIVocabulary GamePractice Reading
noun🔗ShareA valve device in some brass instruments for changing the pitch"The trumpet player pressed the pistons to change the notes of the song. "musicdevicetechnicalChat with AIVocabulary GamePractice Reading
