scratch hardness

noun
resistance of a material, as a stone or metal, to scratching by one of several other materials, the known hardnesses of which are assembled into a standard scale, as the Mohs' scale of minerals.

Origin:
1925–30

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Surface scratch hardness relative to empirical scale.
Pencil scratch hardness before and after exposure tests.
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