iridium
/aɪˈrɪdɪəm/noun
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)。
词源
early 19th cent.: modern Latin, from Latin iris, irid- 'rainbow' (so named because it forms compounds of various colours).