defecation
  澄清,淨化,排便
  def·e·ca·tion /ˌdɛfɪˈkeʃən/ 名詞
  排便,淨化
  Def·e·ca·tion n.
  1. The act of separating from impurities, as lees or dregs; purification.
  2. Physiol. The act or process of voiding excrement.
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  defecation
       n : the elimination of fecal waste through the anus [syn: laxation,
            shitting]