i‧rid‧i‧um /ɪˈrɪdiəm/
noun [uncountable][
Date: 1800-1900;
Language: Latin;
Origin: iris ( ⇒ iris); because when it becomes liquid in a particular acid, it shows the colors of the rainbow]
a hard and very heavy metal that is combined with
platinum to make jewellery and is used in scientific instruments. It is a chemical
element: symbol Ir
[TahlilGaran] Dictionary of Contemporary English ▲