音标：['pistәn]
n. 活塞, 活塞阀键
【医】 活塞(如注射器的)
在线英汉词典

piston的短语、例句：

piston n 1 round plate or short cylinder,usu made of metal or wood, that fits closely inside another cylinder or tube and moves up and down or backwards and forwards inside it; used eg in steam or internal combustion engines to cause other parts to move by means of a connecting rod (`piston-rod) 活塞. =>illus 见插图. 2 sliding valve in a trumpet or other brass wind instrument （铜管乐器上的）活门.