corundum

Noun
  1. Very hard mineral used as an abrasive (synset 114696878)
    is a type of: mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
    subtypes:
    • 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
    substance meronym: emery - a hard grey-black mineral consisting of corundum and either hematite or magnetite; used as an abrasive (especially as a coating on paper)
    same as: corundom

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