The Collaborative International Dictionary of English v.0.48:

Toluene \Tol"u*ene\, n. [Tolu + benzene.] (Chem.)
   A hydrocarbon, C6H5.CH3, of the aromatic series, homologous
   with benzene, and obtained as a light mobile colorless
   liquid, by distilling tolu balsam, coal tar, etc.; -- called
   also methyl benzene, phenyl methane, etc.
   [1913 Webster]

WordNet (r) 3.0 (2006):

toluene
    n 1: a colorless flammable liquid obtained from petroleum or
         coal tar; used as a solvent for gums and lacquers and in
         high-octane fuels [syn: toluene, methylbenzene]