The Collaborative International Dictionary of English v.0.48:

Styrol \Sty"rol\, n. [Styrax + L. oleum oil.] (Chem.)
   See Styrolene.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Styrolene \Sty"ro*lene\, n. (Chem.)
   An unsaturated hydrocarbon, C8H8, obtained by the
   distillation of storax, by the decomposition of cinnamic
   acid, and by the condensation of acetylene, as a fragrant,
   aromatic, mobile liquid; -- called also phenyl ethylene,
   vinyl benzene, styrol, styrene, and cinnamene.
   [1913 Webster]