فسو

المَفْسَى ذ The anus [as being the place of emission of the فُسَاآء]. (TA.) مَا أَقْرَبَ مَحْسَاهُ مِنْ مَفْسَاهُ [ How near is his mouth to his anus! ] is a prov. [expressive of wonder at a man's shortness: see مَحْسًى, in art. حسو]. (S.)