[{"Bold_text": "noun", "List Items": ["Chemistry.a hard, silvery-white, ductile and malleable metallic element, allied to iron and cobalt, not readily oxidized: used chiefly in alloys, in electroplating, and as a catalyst in organic synthesis.:Ni;:58.71;:28;:8.9 at 20°C.", "a cupronickel of the U.S., the 20th part of a dollar, equal to five cents.", "a nickel coin of Canada, the 20th part of a dollar, equal to five cents."]}, {"Bold_text": "verb (used with object)", "List Items": ["to cover or coat with nickel; nickel-plate."]}, {"Bold_text": "adjective", "List Items": ["Slang.costing or worth five dollars:a nickel bag of heroin."]}]