Source : Webster's Revised Unabridged Dictionary (1913)

Rectificator \Rec"ti*fi*ca`tor\ (r?k"t?*f?*k?`t?r), n. (Chem.)
   That which rectifies or refines; esp., a part of a distilling
   apparatus in which the more volatile portions are separated
   from the less volatile by the process of evaporation and
   condensation; a rectifier.