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diverticulum (n.)

"blind tube" (anatomical), 1728, from Modern Latin, from Latin deverticulum "a bypath," from devertere "to turn aside" (see divert). Related: Diverticulitis (1900).

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Definitions of diverticulum from WordNet

diverticulum (n.)
a herniation through the muscular wall of a tubular organ (especially the colon);
From wordnet.princeton.edu