• Any of a group of organic compounds resulting from the condensation reaction of hydrazine and two carbonyl groups.
  • A six-membered heterocyclic compound, such as pyridine, that contains one or more atoms of nitrogen with a ring structure resembling that of benzene.
  • Any of a class of <xref>organic</xref> <xref>compounds</xref>, having the <xref>general formula</xref> R2C=NN=CR2, produced by the action of a <xref>carbonyl</xref> compound with <xref>hydrazine</xref>.
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