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Carborundum (n.)

silicon carbide used as an abrasive, (reg. trademark U.S. June 21, 1892, by Carborundum Co. of Monongahela City, Pa.), from carbon + corundum.

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Definitions of Carborundum from WordNet

carborundum (n.)
an abrasive composed of silicon carbide crystals;
From wordnet.princeton.edu