Longman Dictionary of Contemporary English homepage

Topic: ELEMENTS

Date: 1800-1900
Language: Latin
Origin: iris ( IRIS); because when it becomes liquid in a particular acid, it shows the colors of the rainbow

iridium

 noun
     
i‧rid‧i‧um [uncountable]
HCEMH 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
Definition of iridium from the Longman Dictionary of Contemporary English within
the topic ELEMENTS
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