1. A trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powder
   "Boron is used in the production of heat-resistant glass"; "Boron, atomic number 5, is used in the production of heat-resistant glass";
   - B, atomic number 5

Derived forms: borons

Type of: chemical element, element

Part of: borax, kernite

Encyclopedia: Boron, Mali