corundum ( synonym found)
Definition of corundum:

(n) : an extremely hard mineral, a form of aluminium oxide, that occurs in the form of the gemstones ruby and sapphire; it is used as an abrasive
Definition of corundum:

(n) : an extremely hard mineral, a form of aluminium oxide, that occurs in the form of the gemstones ruby and sapphire; it is used as an abrasive
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