Definition of corundum in English:

corundum

Syllabification: co·run·dum
Pronunciation: /kəˈrəndəm
 
/

noun

Extremely hard aluminum oxide, used as an abrasive. Ruby and sapphire are varieties of corundum.
More example sentences
  • Although blue corundum, zircon, and tourmaline occur in Colorado, they are not known to produce gems.
  • Red gem-quality corundum is known as ruby; all other colors of gem corundum are referred to as sapphire, with a prefix denoting the color of the stone.
  • Several Colorado gem minerals (lazurite and the state's minor occurrences of corundum and cordierite) form in metamorphic rocks.

Origin

early 18th century: from Tamil kuruntam and Telugu kuruvindam.

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