Definition of pepsin noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈpepsɪn//
; NAmE NAmE//ˈpepsɪn//
jump to other results
a substance in the stomach that breaks down proteins in the process of digestion Word Origin mid 19th cent.: from Greek pepsis ‘digestion’ + -in.
See the Oxford Advanced American Dictionary entry: pepsin