活塞 Traditional form: 活塞 Pinyin (reading): huósāi Definitions: piston Characters: 活 - to exist, to live, to survive; living, working 塞 - to stop up, to seal, to cork, to block; pass, frontier; fortress Traditional characters: 活 - to exist, to live, to survive; living, working 塞 - to stop up, to seal, to cork, to block; pass, frontier; fortress