Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Language: Modern Latin
Origin: Spanish platina, from plata; PLATE1

platinum

 noun
     
Related topics: Elements
plat‧i‧num [uncountable]
1HCE a silver-grey metal that does not change colour or lose its brightness, and is used in making expensive jewellery and in industry. It is a chemical element: symbol Pt:
a platinum ring
2 if a music recording goes platinum, at least a million copies of it have been sold:
Eight of Denver's albums went platinum.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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