Definition #1 for "iridium"

a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium


Definition #2 for "iridium"

A rare metallic element of atomic number 77, of the same group as platinum, which it much resembles, being silver-white and indifferent to most corrosive agents, but harder, more brittle, and with a higher melting temperature (2410


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