The discharge of feces from the rectum. SYN: motion (2), movement (3). [L. defaeco, pp. -atus, to remove the dregs, purify]
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def·e·ca·tion or chiefly Brit def·ae·ca·tion .def-i-'kā-shən n discharge of feces
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n.
a bowel movement in which faeces are evacuated through the rectum and anus. The amount and composition of the food eaten determine to a large degree the bulk of the faeces, and the transit time through the intestinal tract determines the water content. See constipation, diarrhoea.
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def·e·ca·tion (def″ə-kaґshən) [L. defaecare to deprive of dregs] 1. the removal of impurities, as chemical defecation. 2. the evacuation of feces from the rectum.Medical dictionary. 2011.