English Dictionary

iridium

/ɪˈɹɪd.i.əm/

noun

(uncountable) A chemical element (symbol Ir) with an atomic number of 77: a very hard, brittle, silvery-white transition metal of the platinum group. / (countable) A single atom of this element.

Iridium is a rare and precious metal.

意味（1）

(uncountable) 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.

意味（2）

(countable) A single atom of this element.