air spring

noun Machinery.

a springlike support utilizing the compressibility of air confined behind a piston in a cylinder.

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British Dictionary definitions for air spring

air spring

noun

mechanical engineering an enclosed pocket of air used to absorb shock or sudden fluctuations of load

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