air cylinder

noun
  1. a cylinder containing air, especially one equipped with a piston and used as a device for checking the recoil of a gun.
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British Dictionary definitions for air cylinder

air cylinder

noun
  1. a cylinder containing air, esp one fitted with a piston and used for damping purposes
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012