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Entry 1 sense Webster, 1913

Orthoxylene

· Or·tho·xy·lene · IPA
01 n. That variety of xylene (C6H4(CH3)2) in which the two methyl groups are in the ortho position; a colorless, liquid, combustible hydrocarbon …
  1. 1.
    That variety of xylene (C6H4(CH3)2) in which the two methyl groups are in the ortho position; a colorless, liquid, combustible hydrocarbon resembling benzene.(Chem.)