The Collaborative International Dictionary
Rubiacin
Rubiacin \Ru"bi*a*cin\, n. [L. rubia madder, fr. rubeus red.] (Chem) A substance found in madder root, and probably identical with ruberythrinic acid.
Wiktionary
rubiacin
n. (context organic compound English) A substance found in madder root, and probably identical with ruberythrinic acid.