The story
From retro- + pancreaticoduodenal.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A medical anatomical term describing a region or structure located behind the pancreas and duodenum. It is commonly used to specify the position of blood vessels, lymph nodes, or spaces in that deep abdominal area. Full definition →
From retro- + pancreaticoduodenal.
Etymology from Wiktionary, CC BY-SA 4.0.