The characteristic purplish-red colour of the flowers or leaves of these plants.
A red to purple azo dye used as a biological stain, and in some countries in cosmetics and as a food colouring.
Any of various herbs of the genus Amaranthus.
The seed of these plants, used as a cereal.
A deep red colour.
A ruby hummer, a South American hummingbird, Clytolaema rubricauda.
A red bird-of-paradise, Paradisaea rubra.
A pronunciation guide written above or beside Chinese or Japanese characters.
A clear, deep, red variety of corundum, valued as a precious stone.
The tincture red or gules.
To make red; to redden.
Of a deep red colour.