corundum Hear it!

corundum Definition

co·run·dum (kə run′dəm)

noun

a very hard mineral, aluminum oxide, AlO: a dark, coarse variety (emery) is used for grinding and polishing; clear, transparent varieties (ruby, sapphire) are used as gems

Etymology: Tamil kurundam < Sans kuruvinda, ruby

corundum Usage Examples

Adjective modifier

  • red: Have a look on the color wheel to see what red corundum is called.
  • synthetic: Pretty sure I saw tiny air bubbles, so reckon they were synthetic corundum.

Noun used with modifier

  • mineral: Sapphires are a precious form of the mineral corundum - second only to diamond in hardness.

Browse dictionary entries near corundum

  1. ‹ Coruña
  2. ‹ Cortland
  3. ‹ cortisone
  4. ‹ cortisol
  5. ‹ cortina
  6. ‹ cortin
  7. ‹ corticotropin
  8. ‹ corticosterone
  9. ‹ corticosteroid
  10. ‹ corticoid
  1. Corunna ›
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  3. coruscation ›
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  8. corvina ›
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  10. Corvus ›