carborundum Syllabification: (car·bo·run·dum)Pronunciation: /ˌkärbəˈrəndəm/Definition of carborundum noun trademark a very hard black solid consisting of silicon carbide, used as an abrasive. Origin: late 19th century (originally US, as a trademark): blend of carbon and corundumcarborundum in other Oxford dictionaries Definition of carborundum in the British & World English dictionary
