Definition of iridium noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ɪˈrɪdiəm//
; NAmE NAmE//ɪˈrɪdiəm//
[uncountable] (symbol Ir)
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a chemical element. Iridium is a very hard yellow-white metal, used especially in making alloys. Word Originearly 19th cent.: modern Latin, from Latin iris, irid- ‘rainbow’ (it has this name because it forms compounds of various colours).
See the Oxford Advanced American Dictionary entry: iridium