Silicon carbide
WordNet
noun
(1) An extremely hard blue-black crystalline compound (SiC) used as an abrasive and a heat refractory material; crystals of silicon carbide can be used as semiconductors
WiktionaryText
Noun
silicon carbide
- a binary compound of silicon and carbon, SiC; it is one of the hardest known materials, and is used as an abrasive, under the trade name Carborundum, and as a refractory material