saponification saponifiable • saponification number · · · Info · Definitions · Characters · · saponification · · Text Latin · · Script 14 · · Length 6 · · Syllables Definitions · · · (noun) a chemical reaction in which an ester is heated with an alkali (especially the alkaline hydrolysis of a fat or oil to make soap). · · Noun Definition 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 f latin small letter f U+0066 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 s latin small letter s U+0073 t latin small letter t U+0074