/ Dictionary / Index S saponin: Meaning and Definition of Find definitions for: sap•o•nin Pronunciation: (sap'u-nin), [key] — n. Biochem. any of a group of amorphous glycosides of terpenes and steroids, occurring in many plants, characterized by an ability to form emulsions and to foam in aqueous solutions, and used as detergents. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: saponin (Thesaurus) saponify saponite 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