iridium

iridium
[ɪˈrɪdɪəm, ʌɪ-]
noun
  1. [mass noun]the chemical element of atomic number 77, a hard, dense silvery-white metal(Symbol: Ir)
    （化学元素）铱(符号: Ir)
  2. Iridium is a member of the transition series and is one of the densest metals. Iridium–platinum alloys are hard and corrosion-resistant and are used in jewellery and for electrical contacts; an alloy with osmium is used in fountain-pen nibs
语源
  1. early 19th cent.: modern Latin, from Latin iris, irid- 'rainbow' (so named because it forms compounds of various colours)
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