One of the saccular pouches or contractions in the colon, visible as segments on the large intestine's surface; also, in classical architecture, a water bucket or reservoir.
From Latin 'haustrum,' meaning a bucket or receptacle for drawing water. The anatomical sense derives from the pouch-like appearance of these colonic segments.
A 'haustrum' is literally a Latin word for a water bucket, but medical students learn it to describe the small pouches in your colon—it's naming something modern inside your body using words for ancient Roman plumbing.
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