Iridium - Definition - Law Dictionary Home Dictionary Definition iridium

Definition :

A rare metallic element of atomic number 77 of the same group as platinum which it much resembles being silver white and indifferent to most corrosive agents but harder more brittle and with a higher melting temperature 2410deg C versus platinum 1772deg C With the exception of osmium it is the heaviest substance known its specific gravity being 224 Symbol Ir Atomic weight 19222