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|Noun||1.||corundom - very hard mineral used as an abrasive|
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
emery - a hard grey-black mineral consisting of corundum and either hematite or magnetite; used as an abrasive (especially as a coating on paper)
alumina, aluminium oxide, aluminum oxide - any of various forms of aluminum oxide occurring naturally as corundum
ruby - a transparent deep red variety of corundum; used as a gemstone and in lasers
sapphire - a precious transparent stone of rich blue corundum valued as a gemstone