WordReference Random House Unabridged Dictionary of American English © 2026
noble metal, 
  1. Chemistry, Metallurgyany of a number of metals, as gold, silver, mercury, or platinum, that resist oxidation when heated in air, and solution by inorganic acids.
  • Middle English: precious metal 1350–1400

'noble metal' also found in these entries (note: many are not synonyms or translations):

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