The story
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: After an ampulla, as for example (usually, more specifically) downstream of the ampulla of Vater in the lumen of the duodenum; structures and events that are postampullary thus exist in the midgut rather than in the foregut. Full definition →
Etymology from Wiktionary, CC BY-SA 4.0.