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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Fusel  \Fu"sel\,  n.,  Fusel  oil  \Fu"sel  oil\  [G.  fusel  bad 
  liquor.]  (Chem.) 
  A  hot,  acrid,  oily  liquid,  accompanying  many  alcoholic 
  liquors  (as  potato  whisky,  corn  whisky,  etc.),  as  an 
  undesirable  ingredient,  and  consisting  of  several  of  the 
  higher  alcohols  and  compound  ethers,  but  particularly  of  amyl 
  alcohol;  hence  specifically  applied  to  amyl  alcohol.