al·lyl /ˈæləl/
  al·lyl /ˈæləl/ 名詞
  烯丙基,2-丙烯基
  Al·lyl n.  Chem. An organic radical, C3H5, existing especially in oils of garlic and mustard.
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  allyl
       n : the univalent unsaturated organic radical C3H5; derived from
           propylene [syn: allyl group, allyl radical]