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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Ethenyl  \Eth"e*nyl\,  n.  [Ethene  +  -yl.]  (Chem.) 
  a  A  trivalent  hydrocarbon  radical,  {CH3.C}. 
  b  A  univalent  hydrocarbon  radical  of  the  ethylene  series, 
  {CH2:CH};  --  called  also  {vinyl}.  See  {Vinyl}.