corundum
kuh ruhn duhm
- n very hard mineral used as an abrasive
- Dov Gruner, 33, a Jew with a bullet-crushed jaw and the corundum-hard eyes of an Irgun Zvai Leumi triggerman, stood before a Jerusalem Military Court.
- Founded in 1902 to mine corundum for use in abrasive wheels, 3M struggled into the manufacture of sandpaper and then into masking tape.
- Acheson called the stuff "carborundum," because he thought it was composed of corundum and carbon before it was analyzed as silicon carbide.