- The lower opening of the digestive tract, lying in the cleft between the buttocks, through which fecal matter is extruded. SYN: anal orifice. [L.]- vestibular a., vulvovaginal a. a congenital malformation in which the a. is imperforate but the rectum opens into the vagina just above the vulva.
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* * *n.the opening at the lower end of the alimentary canal, through which the faeces are discharged. It opens out from the anal canal and is guarded by two sphincters. The anus is closed except during defecation.• anal adj.
* * *(aґnəs) gen. and pl. aґni [L. â€œring, circleâ€] [TA] the distal or terminal orifice of the digestive tract, located in the gluteal cleft. anal adj
Medical dictionary. 2011.