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Xylene

Definition: Any of a group of three metameric hydrocarbons of the
aromatic series, found in coal and wood tar, and so named because found
in crude wood spirit. They are colorless, oily, inflammable liquids,
C6H4.(CH3)2, being dimethyl benzenes, and are called respectively
orthoxylene, metaxylene, and paraxylene. Called also xylol.