English

Definition of corundum noun from the Oxford Advanced Learner's Dictionary

 

corundum

 noun
noun
BrE BrE//kəˈrʌndəm//
 
; NAmE NAmE//kəˈrʌndəm//
 
[uncountable]
 
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an extremely hard form of alumina found in rubies and sapphires. Corundum is used as an abrasive. Word Origin early 18th cent.: from Tamil kuruntam and Telugu kuruvindam.
See the Oxford Advanced American Dictionary entry: corundum