Etymology
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saponification (n.)

"conversion into soap," 1801, from French saponification, from saponifier, from Modern Latin saponificare, from sapon "soap" (see soap (n.)) + -ficare, combining form of Latin facere "to make" (from PIE root *dhe- "to set, put").

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Definitions of saponification

saponification (n.)
a chemical reaction in which an ester is heated with an alkali (especially the alkaline hydrolysis of a fat or oil to make soap);
From wordnet.princeton.edu