Carborundum meaning

kär'bə-rŭn'dəm
A trademark for an abrasive of silicon carbide crystals.
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Very hard abrasives and refractories, esp. silicon carbide, used in grindstones, powders, etc.
proper name
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Such substances.
noun
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Crystals of silicon carbide used as an abrasive.
noun
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Origin of carborundum