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Entry 1 sense Webster, 1913

Paraxylene

· Par·a·xy·lene · IPA
01 n. A hydrocarbon (C6H4(CH3)2) of the aromatic series obtained as a colorless liquid by the distillation of camphor with zinc chloride. It is …
  1. 1.
    A hydrocarbon (C6H4(CH3)2) of the aromatic series obtained as a colorless liquid by the distillation of camphor with zinc chloride. It is one of the three metamers of xylene. Cf. Metamer, and Xylene.(Chem.) See: Metamer, Xylene