Rockwell number
noun Metallurgy.
a numerical expression of the hardness of a metal as determined by a test (Rockwell test ) made by indenting a test piece with a Brale, or with a steel ball of specific diameter, under two successive loads and measuring the resulting permanent indentation.
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Origin of Rockwell number
1930–35, Americanism; named after Stanley P. Rockwell, 20th-century American metallurgist
Words nearby Rockwell number
rock wall, rock wallaby, rockweed, Rockwell, Rockwell, Norman, Rockwell number, rock wool, rockwork, rock wren, rocky, Rocky Hill
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020