| 单词 | palladium |
| 释义 | Word Frequency palladium 1(pəˈleɪdɪəm) noun a ductile malleable silvery-white element of the platinum metal group occurring principally in nickel-bearing ores: used as a hydrogenation catalyst and, alloyed with gold, in jewellery. Symbol: Pd; atomic no: 46; atomic wt: 106.42; valency: 2, 3, or 4; relative density: 1202; melting pt: 1555°C; boiling pt: 2964°C Word origin C19: named after the asteroid Pallas, at the time (1803) a recent discoveryWord Frequency palladium 2(pəˈleɪdɪəm) noun something believed to ensure protection; safeguard Word origin C17: after the PalladiumWord Frequency Palladium(pəˈleɪdɪəm) noun a statue of Pallas Athena, esp the one upon which the safety of Troy depended |
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