Ma'anar ƙamus na kalmar "ostomy" tana nufin hanyar tiyata inda ake ƙirƙirar buɗaɗɗen wucin gadi, wanda ake kira stoma, a cikin jiki don karkatar da kwararar sharar jiki ko ruwa. Wannan buɗewa yana ba da damar kawar da kayan sharar gida daga jiki lokacin da hanyar kawar da al'ada ta daina aiki ko tasiri. Ostomies yawanci ana yin su ne lokacin da tsarin narkewar abinci ko fitsarin mutum ya lalace ko kuma yana buƙatar a keɓe shi saboda yanayin kiwon lafiya daban-daban kamar kansar launin fata, ciwon kumburin hanji, rashin aikin mafitsara, ko lahani na haihuwa. Akwai nau'o'in ostomies daban-daban, ciki har da colostomy (wanda ya shafi hanji), ileostomy (wanda ya shafi ƙananan hanji), da urostomy (wanda ya shafi tsarin urinary).