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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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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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