Rectificator
Rec´ti`fi`ca`tor
| n. | 1. | (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. |
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.