| xylyl | <chemistry> Any one of three metameric radicals which are characteristic respectively of the three xylenes. Origin: Xylo- + -yl. Source: Websters Dictionary (01 Mar 1998) |
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| xylylene | <chemistry> Any one of three metameric radicals, CH2.C6H4.CH2, derived respectively from the three xylenes. Often used adjectively; as, xylylene alcohol. Source: Websters Dictionary (01 Mar 1998) |