The Collaborative International Dictionary
Rufiopin
Rufiopin \Ru`fi*o"pin\, n. [L. rufus reddish + opianic.] (Chem.) A yellowish red crystalline substance related to anthracene, and obtained from opianic acid.
Wiktionary
rufiopin
n. (context chemistry English) A yellowish-red crystalline substance related to anthracene and obtained from opianic acid.