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diacetyl

diˈacetyl Chem.
  See di-2 2, and acetyl.

1872 Watts Dict. Chem. VI. 30 [He] has obtained a colourless pungent liquid, which is probably free acetyl or diacetyl (C2H3O)2. 1883 Syd. Soc. Lex., Diacetyl carbamide CO(NH.C2H3O)2, a product of the action of carbonyl-chloride on urea at 50°C.; it crystallises from hot alcohol in rhombic needles.

Oxford English Dictionary

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