plat‧i‧num /ˈplætənəm, ˈplætɪnəm/ noun [uncountable]
[Date: 1800-1900; Language: Modern Latin; Origin: Spanish platina, from plata; ⇒ plate¹]

1. 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.
a platinum disc

[TahlilGaran] Dictionary of Contemporary English ▲