( n. )
An instrument for measuring the degree of hardness; especially, an instrument for testing the relative hardness of steel rails and the like.
( n. )
An instrument for measuring the degree of hardness; especially, an instrument for testing the relative hardness of steel rails and the like.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012