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.-the color of a ruby; carmine red; a red tint.-that which has the color of the ruby, as red wine. hence, a red blain or carbuncle.-see agate, n., 2.-any species of south american humming birds of the genus clytolaema. the males have a ruby-colored throat or breast.-ruby-colored; red; as, ruby lips.-to make red; to redden.