Hypertext Webster Gateway: "carborundum"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Carborundum \Car`bo*run"dum\, [Carbon + corundum.]
A beautiful crystalline compound, {SiC}, consisting of carbon
and silicon in combination; 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.
From WordNet (r) 1.7 (wn)
carborundum
n : (trade mark) an abrasive composed of silicon carbide
crystals
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