ˈhīdrəˌzōn noun
( -s )
Etymology: International Scientific Vocabulary hydraz- + ket one; originally formed as German hydrazon
: any of a class of compounds containing the grouping >C . NNHR formed by the action of hydrazine or a substituted hydrazine (as phenylhydrazine) on a compound containing the carbonyl group (as an aldehyde or ketone)
acetone hydrazone (CH 3 ) 2 C:NNH 2
— see osazone ; compare azine 2