The Collaborative International Dictionary
Pyroxanthin
Pyroxanthin \Pyr`o*xan"thin\, n. [Pyro- + Gr. ? yellow.] (Chem.) A yellow crystalline hydrocardon extracted from crude wood spirit; -- called also eblanin.
Wiktionary
pyroxanthin
n. (context chemistry English) A yellow, crystalline substance obtained from creosote etc; it seems to be a polycyclic aromatic hydrocarbon.