Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

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