ruby
n. countable B2 Upper Intermediate US //ˈɹubi// UK //ɹˈuːbi// ru·by
n. a deep red, very expensive stone used in jewelry. It is one of the hardest and most valuable gems in the world.
n. a precious stone consisting of corundum in various shades of red. The color is primarily derived from the presence of chromium.
She wore a beautiful ring with a large ruby in the center.
The museum's collection includes a famous ruby that once belonged to a royal family.
Geologists identify the ruby as a variety of the mineral corundum, distinguished from sapphire solely by its vibrant red hue and specific chemical impurities.
The female name derives from ruby in the 19th century. The programming language was named after the gemstone.
Usage
Often used as a modifier before other nouns to describe a deep red color.