compound having the structure R2C=NNR2, formally derived from aldehydes or ketones, formaalselt aldehüüdidest või ketoonidest tulenev ühenditüüp üldvalemiga R2C=NNR2 (kus R on süsivesinikradikaal)

hydrazones - the condensation products of aldehydes and ketones with hydrazine, water being eliminated from the two molecules