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In page Duodenum:

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The name duodenum is Medieval Latin, short for intestīnum duodēnum digitōrum, meaning "intestine of twelve finger-widths (in length)", genitive[citation needed] of duodēnī, "twelve each", (related to duodecim "twelve"). Coined by Gerard of Cremona (d. 1187) in his Latin translation of "Canon Avicennae", "اثنا عشر" itself a loan-translation of Greek dodekadaktylon (δωδεκάδάκτυλον), literally "twelve fingers long". The intestine part was so called by the Greek physician Herophilus (c. 335–280 BCE) for its length, about equal to the breadth of 12 fingers.[1]