from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from The Century Dictionary and Cyclopedia

  • 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.


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