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Entry 1 sense Webster, 1913

Xylylene

· Xy·lyl·ene · IPA
01 n. Any one of three metameric radicals, CH2.C6H4.CH2, derived respectively from the three xylenes. Often used adjectively; as, xylylene alcohol.
  1. 1.
    Any one of three metameric radicals, CH2.C6H4.CH2, derived respectively from the three xylenes. Often used adjectively; as, xylylene alcohol.(Chem.)