WordReference Random House Unabridged Dictionary of American English © 2025
Rock′well num′ber, [Metall.]
- Metallurgya numerical expression of the hardness of a metal as determined by a test (Rock′well 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.
- named after Stanley P. Rockwell, 20th-century American metallurgist 1930–35, American.