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Definition of gastrointestinal tract. medical. : the part of the digestive system that consists of the stomach and intestines.
The gastrointestinal (GI) tract is sometimes referred to as the digestive tract, or the alimentary canal. This is the system of organs in the human body that takes in food, digests it to extract energy and nutrients, and expels the remaining waste. The major functions of the GI tract are digestion and excretion.his is the system of organs in the human body that takes in food, digests it to extract energy and nutrients, and expels the remaining waste. The major functions of the GI tract are digestion and excretion.