Meaning of boron carbide

bo'ron car'bide

Pronunciation: [key]
— Chem. Chem.
  1. a black, crystalline, extremely hard, water-insoluble solid, BC, used chiefly as a moderator in nuclear reactors, as an abrasive, and as a refractory.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.