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What do a.m. and p.m. stand for?

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 of noble metal
1350-1400
1350-1400; Middle English: precious metal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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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.

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