platinum [plat-n-uh m, plat-nuh m]
1. 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. Symbol: Pt; atomic weight: 195.09; atomic number: 78; specific gravity: 21.5 at 20°C.
2. a light, metallic gray with very slight bluish tinge when compared with silver.
3. made of platinum.
4. (of a record, CD, or cassette) having sold a minimum of one million copies.
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Origin: 1805-15; < New Latin, alteration of earlier platina < Spanish; see platina
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