i.rid.i.um
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 92.2; melting point 2,40=C; boiling point 4,30=C; specific gravity 22.42 (at 7=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92.2；熔点2,40=C；沸点4,30=C；比重22.42（在7=C时）；化合价3，4参见 element
来源：Latin oris orid- [rainbow (from the colors produced by dissolving it in hydrochloric acid)] * see irido- 拉丁语 oris orid- [彩虹（将铱溶解于盐酸时会产生彩虹般的颜色）] *参见 irido--ium -ium
