semicarbazone

Century Dictionary and Cyclopedia

1. n. A compound formed by the action of semicarbazin on an aldehyde or a ketone, as the semicarbazone of acetaldehyde, CH₃CH:NNHCONH₂. Such compounds are usually crystalline and are used to isolate or identify aldehydes or ketones.

Wiktionary

1. n. organic chemistry The reaction product of an aldehyde or ketone with semicarbazide; they have the general formula R1R2C=N-NH-CO-NH2