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Definitions of bucky:
noun: (Britain, slang) A gun.
noun: A surname
noun: A nickname for someone with the name Buck, or a given name derived from this.
noun: (medicine, informal) Alternative form of Bucky (“a Potter-Bucky diaphragm”) [A surname]
noun: (medicine, informal) Short for Potter-Bucky diaphragm. [(medicine) A grid of lead strips that can be repositioned to reduce visual artifacts on an X-ray caused by secondary radiation.]