fusel oil noun1 •A mixture of several higher-order alcohols (having more than two carbon atoms) formed as byproduct in the normal fermentation process, captured as part of the tailings in distillation. An excessive concentration, as in low-quality moonshine, causes unpleasant taste.[…] and many simply blamed on the Doosra's known enthusiasms for opium, ganja, and any number of local fusel oils, singly or combined, named and nameless. — 2006 formsfusel oils
