From The Collaborative International Dictionary of English v.0.44 [gcide]:
Toluene \Tol"u*ene\, noun [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.
From WordNet (r) 2.0 [wn]:
noun
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: {methylbenzene}]
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