[{"Bold_text": "noun", "List Items": ["Chemistry.a heavy, grayish-white, highly malleable and ductile metallic element, resistant to most chemicals, practically unoxidizable except in the presence of bases, and fusible only at extremely high temperatures: used for making chemical and scientific apparatus, as a catalyst in the oxidation of ammonia to nitric acid, and in jewelry. : Pt; : 195.09; : 78; : 21.5 at 20°C.", "a light, metallic gray with very slight bluish tinge when compared with silver."]}, {"Bold_text": "adjective", "List Items": ["made of platinum.", "(of an audio recording) having sold a minimum of one million copies."]}]