[{"Bold_text": null, "List Items": ["a brand of revolver."]}, {"Bold_text": "noun", "List Items": ["Samuel,1814–62,U.S. inventor of the Colt revolver."]}, {"Bold_text": "noun", "List Items": ["a young male animal of the horse family.", "a male horse of not more than four years of age.", "a young or inexperienced person."]}]