quinalizarin

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A red crystalline compound, C₁₄H₈O₆, used to dye cotton.

Century Dictionary and Cyclopedia

1. n. A compound, (OH)₂C₆H₂-(CO)₂C₆H₂(OH)₂ or 1,2,5,8-anthraquinonetetrol, made from alizarin and other anthraquinone derivatives; alizarin Bordeaux (which see). It crystallizes in deep-red needles with a green metallic luster, and is used as a dye.

Wiktionary

1. n. organic chemistry 1,2,5,8-tetrahydroxyanthraquinone