biacetyl

[bahy-uh-seet-l, -set-l, bahy-as-i-tl]

noun Chemistry.

a yellow, water-soluble liquid, C₄H₆O₂, occurring in butter and in certain essential oils, as bay, and also synthesized: used chiefly to augment the flavor and odor of vinegar, coffee, and other foods.

Also, diacetyl.

Origin:
bi-¹ + acetyl

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Biacetyl is always a great word to know.

So is alcohol. Does it mean:

any of a class of chemical compounds having the general formula ROH, where R represents an alkyl group and ?OH a hydroxyl group

a reaction in which two or more substances combine to form another compound

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biacetyl

bi·a·ce·tyl