- A compound of boron and carbon, especially B4C, an exceptionally difficult, black colored crystalline substance or solid answer. It's made use of as an abrasive, in charge rods for atomic reactors, and as a reinforcing filament in composite structural materials.
- A binary mixture of boron and carbon, B4C, which an extremely difficult ceramic, and it is found in tank armour, bulletproof vests etc.
Synonym for "boron carbide"
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