DIACETYL Meaning of DIACETYL in English /duy'euh seet"l, -set"l, duy as"i tl/ , n. Chem.biacetyl. [ 1870-75; DI- 1 + ACETYL ] Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012