defecate
Pronunciation: /ˈdɛfɪkeɪt, ˈdiːf-/
(British also defaecate)

Origin:
late Middle English (in the sense 'clear of dregs, purify'): from Latin defaecat- 'cleared of dregs', from the verb defaecare, from de- (expressing removal) + faex, faec- 'dregs'. The current sense dates from the mid 19th century