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Definition of Bullet-proof
1. Adjective. (alternative spelling of bulletproof) (Capable of withstanding a direct shot, reliable, or unbreakable). ¹
¹ Source: wiktionary.com
Medical Definition of Bullet-proof
1. Capable of resisting the force of a bullet. Bullet tree. See Bully tree. Bullet wood, the wood of the bullet tree. Source: Websters Dictionary (01 Mar 1998)