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An acrid, oily, poisonous liquid mixture of amyl alcohols, occurring in incompletely distilled alcoholic liquids and used as a solvent and in the manufacture of explosives and pure amyl alcohols.
[German Fusel, bad liquor, from Low German.]
fusel oil(ˈfjuːzəl) or
(Elements & Compounds) a mixture of amyl alcohols, propanol, and butanol: a by-product in the distillation of fermented liquors used as a source of amyl alcohols
[C19: from German Fusel bad spirits]
fu′sel oil`(ˈfyu zəl, -səl)
a mixture consisting chiefly of amyl alcohols.
[1855–60; < German Fusel bad liquor]