Noun | 1. | ![]() passageway, passage - a path or channel or duct through or along which something may pass; "the nasal passages" alimentary canal, alimentary tract, digestive tract, digestive tube, gastrointestinal tract, GI tract - tubular passage of mucous membrane and muscle extending about 8.3 meters from mouth to anus; functions in digestion and elimination epicardia - the short part of the esophagus extending downward from the diaphragm to the stomach cardiac sphincter - the valve between the distal end of the esophagus and the stomach; the physiological sphincter at the esophagogastric junction |