CARBORUNDUM

carborundum

(noun) an abrasive composed of silicon carbide crystals

Source: WordNet® 3.1

Car`bo*run"dum, [Carbon + corundum.]

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition

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