The Collaborative International Dictionary of English v.0.48:

Chrysene \Chry"sene\, n. [Gr. chryso`s gold.] (Chem.)
   One of the higher aromatic hydrocarbons of coal tar, allied
   to naphthalene and anthracene. It is a white crystalline
   substance, C18H12, of strong blue fluorescence, but
   generally colored yellow by impurities.
   [1913 Webster]