Definitions

1. noun

a rare and valuable alloy of iridium and osmium, extremely rare and difficult to produce.

“The scientist’s discovery of a small sample of osmiridium was a groundbreaking moment in the field of materials science.”

2. proper noun

a rare and valuable alloy of iridium and osmium, extremely rare and difficult to produce, often used to refer to the specific alloy produced by the element.

“The rare osmiridium alloy found in the 19th century was used to create some of the most valuable coins in history.”