n. 1 sliding cylinder fitting closely in a tube in which it moves up and down, used in an internalcombustion engine to impart motion, or in a pump to receive motion. 2 sliding valve in a trumpet etc. [Italian: related IO PESTLE]
n. 1 sliding cylinder fitting closely in a tube in which it moves up and down, used in an internalcombustion engine to impart motion, or in a pump to receive motion. 2 sliding valve in a trumpet etc. [Italian: related IO PESTLE]