from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A compound of boron and carbon, especially B4C, an extremely hard, black crystalline compound or solid solution. It is used as an abrasive, in control rods for nuclear reactors, and as a reinforcing filament in composite structural materials.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A binary compound of boron and carbon, B4C, that is a very hard ceramic, and is used in tank armour, bulletproof vests etc.


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