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From Longman Dictionary of Contemporary English
Related topics: Elements
iridiumi‧rid‧i‧um /ɪˈrɪdiəm/ noun [uncountable]  HCEMHa hard and very heavy metal that is combined with platinum to make jewellery and is used in scientific instruments. It is a chemical element: symbol Ir
Examples from the Corpus
iridiumLike Green's compound, this iridium compound contains two hydrogen atoms that can be eliminated by light.
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