Definition of Ballproof

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Ballproof Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(a.)
Incapable of being penetrated by balls from firearms.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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ballproof
\ball"proof`\ (&?;), a. incapable of being penetrated by balls from firearms.