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 of scratch hardness
First recorded in 1925–30
Words nearby scratch hardness
scratch,
scratch awl,
scratch card,
scratch coat,
scratch file,
scratch hardness,
scratch hit,
scratch line,
scratch one's head,
scratch pad,
scratch sheet