noble metal
noun
any of a number of metals, as gold, silver, mercury, or platinum, that resist oxidation when heated in air, and solution by inorganic acids.
Origin of noble metal
1350–1400; Middle English: precious metal
Words nearby noble metal
nobility,
noble,
noble art,
noble fir,
noble gas,
noble metal,
noble opal,
noble rot,
noble savage,
noble-minded,
nobleman