Corundum (noun)

  1. A crystalline form of aluminum oxide that is a mineral and a valuable gemstone.
  2. A naturally occurring mineral that is a form of aluminum oxide and can be found in various colors including red (ruby), blue (sapphire), and colorless (white sapphire).

Origin:

From the tamil word 'kurundam' meaning 'ruby'.

Examples:

  1. The corundum was valued for its beauty and rarity.
  2. The corundum was used in jewelry and other decorative objects.
  3. The red corundum is known as a ruby.
  4. The blue corundum is known as a sapphire.
  5. The colorless corundum is known as a white sapphire.
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