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The duodenum is a short portion of the small intestine connecting it to the stomach. It is about 10 inches (25 cm) long, while the entire small intestine measures about 20 feet (6.5 meters).
Middle English, from Medieval Latin, short for intestÄ«num duodÄnum digitÅrum, intestine of twelve finger-widths (in length) , from Latin duodÄnum, genitive pl. of duodÄnÄ«, twelve each, from duodecim, twelve; see duodecimal. Origin of duodenum. Related Forms: 1  duâ²oÂ·deâ²nal.