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plural diverticulums or diverticula
(anatomy) A small out-pouching of an organ wall such as the large intestine or urinary bladder. quotations examples
Diverticula are small, light-bulb-shaped pouches in the bowel wall, resulting from the tissue in the gut bulging outwards under pressure.
2015, Giulia Enders, translated by David Shaw, Gut, Scribe, published 2016, page 16