Definition of abscissor in US English:

abscissor

noun

  • Botany. An instrument which measures the force required to cause abscission, or the proportion of abscission caused by the application of a known force.

Origin

Late Middle English (in an earlier sense). Originally from post-classical Latin abscisorium cutting instrument; subsequently from classical Latin absciss-, past participial stem of abscindere abscind + -or.