\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.