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Car·bo·run·dum A beautiful crystalline compound, silicon carbide (SiC), consisting of carbon and silicon in combination; -- also called carbon silicide. It is made by heating carbon and sand together in an electric furnace. The commercial article is dark-colored and iridescent. It is harder than emery, and is used as an abrasive.
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silicon carbide
n : 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