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i·rid·i·um AHD[ĭ-rĭdʹē-əm] D.J.[ɪˈrɪdiːəm]K.K.[ɪˈrɪdiəm]n.Symbol Ir （名词）符号 Ir - A very hard and brittle, exceptionally corrosion-resistant, whitish-yellow metallic element occurring in platinum ores and used principally to harden platinum and in high-temperature materials, electrical contacts, and wear-resistant bearings. Atomic number 77; atomic weight 192.2; melting point 2,410°C; boiling point 4,130°C; specific gravity 22.42 (at 17°C); valence 3, 4. See table at element 铱：一种坚硬而脆的，极抗腐蚀的黄白色金属，存在于铂矿中，主要用来硬化铂和制造耐高温材料，电器接头和耐磨轴承。原子序数77；原子重192.2；熔点2,410°C；沸点4,130°C；比重22.42（在17°C时）；化合价3，4 参见 element
- Latin īris īrid- [rainbow (from the colors produced by dissolving it in hydrochloric acid)] * see irido- 拉丁语 īris īrid- [彩虹（将铱溶解于盐酸时会产生彩虹般的颜色）] * 参见 irido-
- -ium -ium
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