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n. precious metallic element of the platinum group (Chemistry); modern satellite communications system that enables mobile telephone communications everywhere in the world (Cellular Communication)
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Iridium ( ) is the chemical element with atomic number 77, and is represented by the symbol Ir. A very hard, brittle, silvery-white transition metal of the platinum family, iridium is the second-densest element (after osmium) and is the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Although only certain molten salts and halogens are corrosive to solid iridium, finely divided iridium dust is much more reactive and can be flammable.
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1. a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium
(synonym) Ir, atomic number 77
(hypernym) metallic element, metal
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n. iridium, precious metallic element of the platinum group (Chemistry)
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nm. iridium, precious metallic element of the platinum group (Chemistry); modern satellite communications system that enables mobile telephone communications everywhere in the world (Cellular Communication)
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