ジアセチルalso: だいあせちるMeanings1noundiacetylChemical term for the organic compound with the formula (CH₃CO)₂, known for its buttery flavor and used in food flavorings.See also: ビアセチルジアセチルはバターのような香かおりを持もつ化か合ごう物ぶつです。Diacetyl is a compound that has a butter-like aroma.