Outpouching of a hollow structure in the body, that may be acquired (as in colonic diverticulitis) or be present at birth (e.g., Meckel diverticulum or Zenker diverticulum).
Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 745 (https://doi.org/10.1515/pac-2015-1202)