English definition of Iridium

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Definition of iridium

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Iridium (n.) 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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Iridize :: Iridize (v. t.) To point or tip with iridium, as a gold pen..

Iridium :: Iridium (n.) 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..

Platiniridium :: Platiniridium (n.) A natural alloy of platinum and iridium occurring in grayish metallic rounded or cubical grains with platinum.

Iridious :: Iridious (a.) Of or pertaining to iridium; -- applied specifically to compounds in which iridium has a low valence.

Iridic :: Iridic (a.) Of or pertaining to iridium; -- said specifically of those compounds in which iridium has a relatively high valence.

Iridosmium :: Iridosmium (n.) The native compound of iridium and osmium. It is found in flattened metallic grains of extreme hardness, and is often used for pointing gold pens..