noble metal 
noun Chemistry
A metal (e.g. gold, silver, or platinum) that resists chemical action, does not corrode, and is not easily attacked by acids.In recent technology, thiols are used to create self-assembled monolayers on gold and other noble metals, which are protected from oxidation and other chemical effects....
- All are rare, expensive, and classified chemically as noble metals.
- Metal compounds have a lower density of free electrons than noble metals, and they exhibit SPE at longer wavelengths.
- marketspace
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- market test
- market-tested
- market testing
- market timer
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- market town
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- market wagon
- market woman
- markhor
- marking
- marking-down
- marking flag
- marking ink
- marking-nut tree
- marking-off
- marking-out