The Collaborative International Dictionary
Rubiretin
Rubiretin \Ru`bi*re"tin\, n. [Rubian + Gr. ? resin.] (Chem.) One of the red dye products extracted from madder root, and probably identical with ruberythrinic acid.
Wiktionary
rubiretin
n. (context chemistry English) One of the red dye products extracted from madder root, probably identical with ruberythrinic acid.