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acetoin

[uh-set-oh-in]
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noun Chemistry.
  1. a yellowish, pleasant-smelling liquid, C4H8O2, obtained from various carbohydrates, as glucose, by fermentation: used chiefly in the manufacture of flavors and essences.
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Origin of acetoin

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018