saponification
process that involves conversion of fat or oil into soap and alcohol by the action of heat in the presence of aqueous alkali
en-GB/ˌsæpəˌnɪfɪˈkeɪʃən/
en-US/səˌpɑnəfəˈkeɪʃən/
process that involves conversion of fat or oil into soap and alcohol by the action of heat in the presence of aqueous alkali