Relating to or involving both the stomach and the jejunum, which is the middle section of the small intestine.
From gastro- (stomach) + jejunal (from Latin jejunus, meaning 'empty', because this part of the intestine appears empty when examined). The term describes anatomical relationships between these two digestive organs.
The jejunum gets its name 'jejunus' (empty) because medieval anatomists would find it empty during dissections—they didn't realize it was simply between meals!
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