Definition of "bucky"

Like for a gun, you could say a gat but that's quite an old term. Most young people now would say stralley, a tool or a bucky.

2011 October 21, Tony Thorne, Dictionary of Contemporary Slang‎, Bloomsbury Publishing

There are two major types of bucky assemblies: reciprocating and recipromatic. The difference is that the reciprocating bucky moves at two different speeds during the exposure […]

2003, Stephen S. Hiss, Understanding Radiography, 4th edition, page 274