Rockwell hardness
noun
Rock·well hardness
ˈräˌkwel-,
-kwəl-
: the hardness of a metal or alloy measured by an apparatus in which a diamond-pointed cone is pressed into the metal to a standard depth to determine the relative resistance to penetration as indicated automatically by a number on a dial
Word History
Etymology
after Stanley P. Rockwell, 20th century American metallurgist
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