Definitions of ruby:

• noun:   a transparent piece of ruby that has been cut and polished and is valued as a precious gem
• noun:   a transparent deep red variety of corundum; used as a gemstone and in lasers
• noun:   a deep and vivid red
• adjective:   having any of numerous bright or strong colors reminiscent of the color of blood or cherries or tomatoes or rubies
• name:  A female given name (very common: 1 in 452 females; popularity rank in the U.S.: #90)
• name:  A surname (rare: 1 in 25000 families; popularity rank in the U.S.: #3478)