noun

• (dated, poetic) An imaginary flower that does not wither.
• Any of various herbs of the genus Amaranthus.
• The characteristic purplish-red colour of the flowers or leaves of these plants.
• (chemistry) A red to purple azo dye used as a biological stain, and in some countries in cosmetics and as a food colouring.
• (cooking) The seed of these plants, used as a cereal.