platinum disc

noun

1. (in Britain) an album certified to have sold 300 000 copies or a single certified to have sold 600 000 copies
2. (in the US) an album or single certified to have sold one million copies Compare gold disc silver disc

When heated on a platinum disc, it burns away with a bright flame, leaving no residuum.

In this tube a platinum disc is placed at the focus of the concave cathode.

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