saponifier

from The Century Dictionary.

• noun An apparatus for the manufacture of glycerin and the fatty acids, by the decomposition of fats and the isolation of their several constituents.
• noun A substance that produces saponification, as caustic soda or potash.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Chem.) That which saponifies; any reagent used to cause saponification.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun chemistry Any reagent used for saponification.