duodenocholecystostomy du·o·de·no·cho·le·cys·tos·to·my (d&oomacr;'ə-dē'nō-kō'lĭ-sĭ-stŏs'tə-mē, dy&oomacr;'-, d&oomacr;-ŏd'n-ō-, dy&oomacr;-) n. The formation of a fistula between the duodenum and the gallbladder. Also called duodenocystostomy.