digestive system, gastrointestinal system, systema alimentarium, systema digestorium - the system that makes food absorbable into the body

succus, juice - any of several liquids of the body; "digestive juices"

gastric juice - digestive secretions of the stomach glands consisting chiefly of hydrochloric acid and mucin and the enzymes pepsin and rennin and lipase

pancreatic juice - a fluid secreted into the duodenum by the pancreas; important for breaking down starches and proteins and fats

bile, gall - a digestive juice secreted by the liver and stored in the gallbladder; aids in the digestion of fats