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noble metal

noun
1.
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
1350-1400
1350-1400; Middle English: precious metal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for noble metal
  • Her research background is in heterogeneous catalysis and highly dispersed noble metal catalysts.
  • Also, in addition to promoting oxygen storage, ceria also helps maintain the dispersion of the catalyst's noble metal particles.
Encyclopedia Article for noble metal

any of several metallic chemical elements that have outstanding resistance to oxidation, even at high temperatures; the grouping is not strictly defined but usually is considered to include rhenium, ruthenium, rhodium, palladium, silver, osmium, iridium, platinum, and gold; i.e., the metals of groups VIIb, VIII, and Ib of the second and third transition series of the periodic table.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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