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alimentary canal
Image courtesy of the University of Alabama, http://images.main.uab.edu/healthsys/ei_0132.gif

alimentary canal:

The tube in the body of humans and animals through which food passes and is digested. The alimentary canal includes the esophagus, the stomach, and the intestines. [Alimentary comes from a Latin word meaning “to nourish” or “to feed.”]