encopresisPronunciation: /ˌɛnkəʊˈpriːsɪs/Definition of encopresis noun [mass noun] Medicine involuntary defecation, especially associated with emotional disturbance or psychiatric disorder. Origin:modern Latin, from Greek en- 'in' + kopros 'dung'encopresis in other Oxford dictionaries Definition of encopresis in the US English dictionary