| 释义 | 
		Definition of piston packing in English: piston packingnoun 1Any material used for filling the space between a piston head and the cylinder within which it moves, so as to prevent steam, air, etc., leaking out. 2A mechanical device for inserting such packing material around a piston head. 
 Origin   Mid 19th century; earliest use found in Scientific American.    Definition of piston packing in US English: piston packingnoun 1Any material used for filling the space between a piston head and the cylinder within which it moves, so as to prevent steam, air, etc., leaking out. 2A mechanical device for inserting such packing material around a piston head. 
 Origin   Mid 19th century; earliest use found in Scientific American.     |