cystoduodenal ligament cys·to·du·o·de·nal ligament (sĭs'tō-d&oomacr;'ə-dē'nəl, -dy&oomacr;'-, -d&oomacr;-ŏd'n-əl, -dy&oomacr;-) n. A peritoneal fold occurring occasionally and passing from the gallbladder to the first part of the duodenum.
