<p><strong>Noun:</strong></p><ul><li>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</li><li>Pt</li><li>195.09</li><li>78</li><li>21.5 at 20°C</li><li>a light, metallic gray with very slight bluish tinge when compared with silver</li></ul><p><strong>Adjective:</strong></p><ul><li>made of platinum</li><li>(of an audio recording) having sold a minimum of one million copies</li></ul>