iridium
UK /ɪˈɹɪd.i.əm/ US /ɪˈɹɪd.i.əm/
noun 2
Definitions
noun
1
A chemical element (symbol Ir) 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.
2
A single atom of this element.
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