n. [ Xylo- + -yl. ] (Chem.) Any one of three metameric radicals which are characteristic respectively of the three xylenes. [ 1913 Webster ]

n. (Chem.) Any one of three metameric radicals, CH2.C6H4.CH2, derived respectively from the three xylenes. Often used adjectively; as, xylylene alcohol. [ 1913 Webster ]