What is the meaning of ruby?

noun

• A transparent piece of ruby that has been cut and polished and is valued as a precious gem.
• A transparent deep red variety of corundum; used as a gemstone and in lasers.
• A deep and vivid red color.
  • synonyms: crimson, deep red

adjective

• Of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies.
  • synonyms: red, reddish, ruddy, blood-red, carmine, cerise, cherry, cherry-red, crimson, ruby-red, scarlet