Brinell' hard'ness num"ber
a rating obtained from a test (Brinell' test") to determine the hardness of a metal by pressing a steel ball of a standard size into the metal using a standard force. Also called Brinell' num"ber. Abbr.: Bhn
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.