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Definition of Carborundum™ noun from the Oxford Advanced Learner's Dictionary

Carborundum™

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