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Corundum

noun

Definitions

Noun
  1. 1
    An extremely hard mineral, a form of aluminum oxide with the chemical formula Al₂O₃, that occurs in the form of the gemstones sapphire and ruby; it is used as an abrasive. countable, uncountable
  2. 2
    very hard mineral used as an abrasive wordnet

Etymology

From Tamil குருந்தம் (kuruntam, “ruby, sapphire”) First attested in the early 18th century.

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