Definition of iridium in English:

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Pronunciation: /ɪˈrɪdɪəm/
Pronunciation: /ʌɪˈrɪdɪəm/


[mass noun]
The chemical element of atomic number 77, a hard, dense silvery-white metal. (Symbol: Ir)
Example sentences
  • Jewellery made of platinum, iridium and palladium gleamed majestically, now and then emitting flashes of brilliant light from the studded diamonds.
  • 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.


Early 19th century: modern Latin, from Latin iris, irid- 'rainbow' (so named because it forms compounds of various colours).

Words that rhyme with iridium

cryptosporidium, cymbidium, idiom, rubidium

For editors and proofreaders

Line breaks: irid|ium

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