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corundum

Line breaks: cor¦un|dum
Pronunciation: /kəˈrʌndəm
 
/

Definition of corundum in English:

noun

[mass noun]
Extremely hard crystallized alumina, used as an abrasive. Ruby and sapphire are varieties of corundum.
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.

Definition of corundum in:

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