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

 

iridium

 noun
noun
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 Origin early 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