The Collaborative International Dictionary
Quinizarin
Quinizarin \Qui*niz"a*rin\, [Hydroquinone + alizarin.] (Chem.) A yellow crystalline substance produced artificially. It is isomeric with alizarin.
Wiktionary
quinizarin
n. (context chemistry archaic English) A yellow crystalline substance produced artificially and isomeric with alizarin.