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Iridium is a stable metal that chemically unreactive, like platinum and gold. Iridium is the most resistant to oxidation of all metals. It can be used is as a hardening agent in alloys with Platinum and Osmium. Sometimes used in medical therapies e.g. treating prostate cancer by radiation therapy.
iridium in American English (aÉªËrÉªdiÉm ; Ä«ridËÄÉm; ÉªËrÉªdiÉm ; iridËÄÉm) noun. a white, extremely dense, brittle, corrosion-resistant chemical element, one of the platinum metals: alloys of iridium are used in electrodes, pen points, crucibles, etc.: symbol, Ir; at. no., 77. see the periodic table of elements in the Reference Supplement.