Dictionary  plat•i•numPronunciation: (plat'n-um, plat'num), [key] —n. 1. Chem.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. Symbol: Pt; at. wt.: 195.09; at. no.: 78; sp. gr.: 21.5 at 20°C. 2. a light, metallic gray with very slight bluish tinge when compared with silver. —adj. 1. made of platinum. 2. Music Slang.(of a recording or record album) having sold a minimum of two million single records or one million LPs. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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