1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Olefiant  \O*le"fi*ant\,  a.  [F.  ol['e]fiant,  fr.L.  oleum  oil  + 
  -ficare  (in  comp.).  Cf  {-Fy}.]  (Chem.) 
  Forming  or  producing  an  oil;  specifically,  designating  a 
  colorless  gaseous  hydrocarbon  called  ethylene.  [Archaic] 

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