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1. (n.) iridium
a precious metallic element resembling platinum: used in alloys.
iridology.
Etymology: (1804; < L īrid-, s. of īris rainbow (see iris ) + -ium2; so named from its iridescence when dissolved in hydrochloric acid)
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| Definition of 'iridium' |
Princeton's WordNet |
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1. (noun) iridium, Ir, atomic number 77
a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium
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| Definition of 'iridium' |
Webster Dictionary |
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1. (noun) iridium
a rare metallic element, of the same group as platinum, which it much resembles, being silver-white, but harder, and brittle, and indifferent to most corrosive agents. With the exception of osmium, it is the heaviest substance known, its specific gravity being 22.4. Symbol Ir. Atomic weight 192.5
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| Definitions of 'iridium' |
The Nuttall Encyclopedia |
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1. iridium
a metallic elementary body of rare occurrence, and found in the ores of platinum.
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| Definition of 'iridium' |
U.S. National Library of Medicine |
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1. iridium
A metallic element with the atomic symbol Ir, atomic number 77, and atomic weight 192.22.
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Definitions of iridium 
