diverticulum
noun
di·ver·tic·u·lum
ˌdī-vər-ˈti-kyə-ləm
plural diverticula
ˌdī-vər-ˈti-kyə-lə
1
: an abnormal pouch or sac opening from a hollow organ (such as the intestine or bladder)
2
: a pocket or closed branch opening off a main passage
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Merriam-Webster unabridged
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