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(dÄ«'vÃ»r-tÄ­k'yÉ-lÉm) Plural diverticula. A pouch or sac branching out from a portion of the gastrointestinal tract, especially the large intestine. A diverticulum can occur as a normal structure, or it can be caused by a hernia.
Medical Definition of Zenker's diverticulum. : an abnormal pouch in the upper part of the esophagus in which food may become trapped causing bad breath, irritation, difficulty in swallowing, and regurgitationâcalled also pharyngoesophageal diverticulum; compare pulsion diverticulum.