noun ·see agate, ·noun, 2.
2. ruby ·adj ruby-colored; red; as, ruby lips.
3. ruby ·noun the color of a ruby; carmine red; a red tint.
4. ruby ·vt to make red; to redden.
5. ruby ·noun that which has the color of the ruby, as red wine. hence, a red blain or carbuncle.
6. ruby ·noun any species of south american humming birds of the genus clytolaema. the males have a ruby-colored throat or breast.
7. ruby ·noun a precious stone of a carmine red color, sometimes verging to violet, or intermediate between carmine and hyacinth red. it is a red crystallized variety of corundum.