defecation
noun [ U ] medical formal or specialized uk/def.əˈkeɪ.ʃən/ us/def.əˈkeɪ.ʃən/
排便
the act of passing the contents of the bowels out of the body
Normal defecation frequency varies from three times a day to three times a week. 正常的排便频率从一天三次到一周三次不等。