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1570s, "to purify," from Latin defaecatus, past participle of defaecare "cleanse from dregs, purify," from the phrase de faece "from dregs" (plural faeces; see feces). Excretory sense first recorded 1830 (defecation), American English, from French. Related: Defecated; defecating.
defecate def·e·cate (děf'ĭ-kāt')
v. def·e·cat·ed, def·e·cat·ing, def·e·cates
To void feces from the bowels.