/ Dictionary / Index S saponify: Meaning and Definition of Find definitions for: sa•pon•i•fy Pronunciation: (su-pon'u-fī"), [key] — v., -fied, -fy•ing. —v.t. to convert (a fat) into soap by treating with an alkali. to decompose (any ester), forming the corresponding alcohol and acid or salt. —v.i. to become converted into soap. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: saponify (Thesaurus) saponification number saponin Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language