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Ir British & World English

The chemical element iridium

ir- British & World English

Variant spelling of in-, in- assimilated before r (as in irradiate, irrelative).

iridium British & World English

The chemical element of atomic number 77, a hard, dense silvery-white metal

Ir in iridium British & World English

The chemical element of atomic number 77, a hard, dense silvery-white metal