Definition of "boron"

boron

/ˈbɔːˌɹɒn/

noun
usually uncountable, plural borons
1. The chemical element (symbol B) with an atomic number of 5, which is a metalloid found in its pure form as a dark amorphous powder.
  Quotations
  The B6-type octahedral borons are each bonded to five other boron atoms; four are part of the same octahedron, and one is external to this octahedron.
  1976, Allen M[yron] Alper, editor, Phase Diagrams: Materials Science and Technology (Refractory Materials; 6), New York, N.Y., London: Academic Press, page 106
2. A single atom of this element.
  Quotations
  For each X point, four borons in the same plane composing a B6 cluster provide these orbitals.
  2001 August 10, J. Akimitsu, K. Takenawa, K. Suzuki, H. Harima, Y. Kuramoto, “High-Temperature Ferromagnetism in CaB2C2”, in Science‎, volume 293, number 5532, pages 1125–1127