1. A red or orange dye obtained from the root of the madder plant or synthesized chemically, historically used in textiles and now in paints and inks.
Usage: Also used in chemistry and art as a pigment and indicator.

Examples

• Alizarin was one of the most important red dyes in the textile industry before synthetic alternatives became widespread.
• The artist mixed alizarin with other pigments to achieve the desired shade of crimson.
• Medieval dyers extracted alizarin from madder roots to create vibrant red fabrics.
• In chemistry labs, alizarin is sometimes used as a pH indicator.
• The fabric was dyed with alizarin, giving it a rich, warm red color.