Carborundum™
noun/ˌkɑːbəˈrʌndəm/
/ˌkɑːrbəˈrʌndəm/
[uncountable] (chemistry)- a very hard black solid substance, used as an abrasiveWord Originlate 19th cent. (originally US, as a trademark): blend of carbon and corundum
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Carborundum™