encopresis
Concise Oxford English Dictionary © 2008 Oxford University Press:
encopresis /ˌɛnkəʊˈpriːsɪs/
▶noun Medicine involuntary defecation, especially associated with emotional or psychiatric disorder.
– origin mod. L., from Gk en- ‘in’ + kopros ‘dung’.
'encopresis' also found in these Oxford entries:

