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Definition of gastrointestinal tract. medical. : the part of the digestive system that consists of the stomach and intestines.
Human gastrointestinal tract. The gastrointestinal system is the body system that eats and digests food; it is also called a digestive system. By breaking down food into simple chemicals that can be absorbed by other parts of the body so the chemicals can be used for energy and building the body, it also gets rid of waste after digestion.