Definition of: diverticulum

(dī′vər·tik′yə·ləm) noun plural ·la (-lə) Anat.
A blind pouch or structure which has arisen or developed from another larger one, as the cecum, the air bladder of a fish, or the lungs of a vertebrate, all of which arise from the intestinal canal. [<L diverticulum, deverticulum a by–path <divertere. See DIVERT.]
—di′ver·tic′u·lar adjective