| 单词 | iridium |
| 释义 | Word Frequency iridium(aɪˈrɪdɪəm, ɪˈrɪd-) noun a very hard inert yellowish-white transition element that is the most corrosion-resistant metal known. It occurs in platinum ores and is used as an alloy with platinum. Symbol: Ir; atomic no: 77; atomic wt: 192.22; valency: 3 or 4; relative density: 22.42; melting pt: 2447°C; boiling pt: 4428°C Word origin C19: New Latin, from irido- + -ium; from its colourful appearance when dissolving in certain acids |
| 随便看 |
英语词典包含233703条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。