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/ɪˈɹɪd.i.əm/ · noun
(uncountable) A chemical element with an atomic number of 77: a very hard, brittle, silvery-white transition metal of the platinum group..
Iridium is extremely rare on the surface of the earth but much more common in meteorites.
Use iridium when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Iridium means (uncountable) A chemical element with an atomic number of 77: a very hard, brittle, silvery-white transition metal of the platinum group..
Common synonyms include atomic number 77, ir.
The opposite depends on the specific sense.
Iridium is extremely rare on the surface of the earth but much more common in meteorites.
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