
• 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.
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http://thinkexist.com/dictionary/meaning/fusel_oil/

Not really an oil in the usual sense. Fusel oil is made up primarily of higher alcohols and is obtained by distillation of lees or wine into brandy. Much of the flavour of brandy can be identified as the higher alcohols and their esters, all of which are collectively known as fusel oil. Concentrated fusel oil floats in a layer on top of water, appe...
Found on
http://www.edenwines.co.uk/Glossary_f.html

<chemistry> 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. ... Origin: G. Fusel bad liquor. ... Source: Webster...
Found on
http://www.encyclo.co.uk/local/20973

Type: Term Definitions: 1. a mixture of side products of alcoholic fermentation; consists primarily of alcohols (amyl, propyl, isoamyl, and isobutyl alcohols).
Found on
http://www.medilexicon.com/medicaldictionary.php?t=62365

Fusel oil is the residue left after removing the ethyl alcohol from various liquors obtained by fermentation, potato spirit being the best source. Fusel oil consists principally of isoamyl and normal amyl alcohols, together with smaller amounts of butyl alcohol, and various aldehydes and esters. It is a poisonous, unpleasant smelling, oily liquid p...
Found on
http://www.probertencyclopaedia.com/browse/GF.HTM

[
n] - a mixture of amyl alcohols and propanol and butanol formed from distillation of fermented liquors
Found on
http://www.webdictionary.co.uk/definition.php?query=fusel%20oil

A mixture of amyl alcohol, isoamyl alcohol and some lower alcohol and their esters.
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http://www.winning-homebrew.com/brewing-terms.html

Liquid with a characteristic unpleasant smell, obtained as a by-product of the distillation of the product of any alcoholic fermentation, and used in paints, varnishes, essential oils, and plastics. It is a mixture of fatty acids, alcohols, and esters
Found on
https://www.encyclo.co.uk/local/21221

A congener produced during fermentation.
Found on
https://www.encyclo.co.uk/local/21392

a mixture consisting chiefly of amyl alcohols obtained as a by-product in the fermentation of grains.
Found on
https://www.infoplease.com/dictionary/fusel-oil
No exact match found.