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Definition of gastrointestinal tract. medical. : the part of the digestive system that consists of the stomach and intestines.
Gastrointestinal (Stomach and Intestines, part of the digestive system) The gastrointestinal tract (or stomach and intestines) digests food and makes it ready to be absorbed into the bloodstream. Then it removes wastes from the bloodstream and excretes it from the body. It is part of the digestive system .