fusel oil

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fu·sel oil

a mixture of side products of alcoholic fermentation; consists primarily of alcohols (for example, amyl, propyl, isoamyl, and isobutyl alcohols).
References in periodicals archive ?
Although yeast manufacturers claim their strains produce fusel alcohol, this may not be of consequence to the winemaker.
Also, fusel alcohols can contribute positively to the aroma of an aged wine.
Fusel alcohols can arise from two different pathways: catabolism of amino acids via the Ehrlich pathway and metabolism of sugar through anabolic pathways.
Notable fusel alcohols, and unpleasant bitterness," Von Bair said.