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scratch hardness

noun
1.
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 of scratch hardness
1925-1930
First recorded in 1925-30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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