| Noun | 1. | ruby - a transparent piece of ruby that has been cut and polished and is valued as a precious gem | |
| 2. | ruby - a transparent deep red variety of corundum; used as a gemstone and in laserstransparent gem - a gemstone having the property of transmitting light without serious diffusion | |
| 3. | ruby - a deep and vivid redred, redness - the quality or state of the chromatic color resembling the hue of blood | |
| Adj. | 1. | ruby - having any of numerous bright or strong colors reminiscent of the color of blood or cherries or tomatoes or rubiesblood-red, carmine, cerise, cherry, cherry-red, crimson, red, reddish, ruby-red, scarlet, ruddy chromatic - being or having or characterized by hue | |