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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Isoprene  \I"so*prene\,  n.  [Etymol.  uncertain.]  (Chem.) 
  An  oily,  volatile  hydrocarbon,  obtained  by  the  distillation 
  of  caoutchouc  or  guttaipercha.