| 单词 | platinum |
| 释义 | platinum /plat"n euhm, plat"neuhm/, 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. 3. made of platinum. 4. (of a record, CD, or cassette) having sold a minimum of one million copies. [1805-15; < NL, alter. of earlier platina < Sp; see PLATINA] |
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