東司とうすMeanings1nountoilet in a Zen monasterySpecifically refers to the lavatory within a Zen Buddhist monastery. The term is technical and not used in everyday conversation.See also: 東浄禅ぜん寺でらでは、東司とうすは修しゅ行ぎょうの場ばの一ひとつとして清せい潔けつに保たもたれる。In a Zen temple, the toilet is kept clean as one of the places of practice.