rubian
Ru"bi*an, n. Etym: [L. rubia madder, fr. rubeus red.] (Chem.) Defn: One of several color-producing glycosides found in madder root.
Ru"bi*an, n. Etym: [L. rubia madder, fr. rubeus red.] (Chem.) Defn: One of several color-producing glycosides found in madder root.