%alizarine%

n. [ F. alizarine, fr. alizari. ] (Chem.) A coloring principle, C14H6O2(OH)2, found in madder, and now produced artificially as an an orange-red crystalline compound from anthracene. It is used in making red pigments (such as the Turkish reds), and in dyeing. [ 1913 Webster WordNet 1.5 ]