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[mass noun] The chemical element of atomic number 77, a hard, dense silvery-white metal.
- ‘The new electrochemical system is based on a magnesium anode, a seawater/catholyte electrolyte and an electrocatalyst of palladium and iridium catalyzed on carbon paper.’
- ‘The earth's crust is depleted in iridium and other platinum group elements, while meteorites are enriched in them.’
- ‘They found the rare element iridium in the thin clay layer that caps the rocks of the Cretaceous era.’
- ‘Previously, it was thought that any asteroid or comet collision would leave strong evidence of the element iridium, the signal found in the sedimentary layer from the time of the dinosaur extinction.’
- ‘Jewellery made of platinum, iridium and palladium gleamed majestically, now and then emitting flashes of brilliant light from the studded diamonds.’
Early 19th century: modern Latin, from Latin iris, irid- rainbow (so named because it forms compounds of various colours).
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