The Collaborative International Dictionary of English v.0.48:

Stilbene \Stil"bene\, n. [See Stilbite.] (Chem.)
   A hydrocarbon, C14H12, produced artificially in large, fine
   crystals; -- called also diphenyl ethylene, toluylene,
   etc.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Toluylene \Tol"u*yl*ene\, n. (Chem.)
   (a) Same as Stilbene.
   (b) Sometimes, but less properly, tolylene.
       [1913 Webster]