[doo-uh-deen-l, dyoo-; doo-od-n-uhl, dyoo-]
of or pertaining to the duodenum.

1835–45; duoden(um) + -al1

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duodenum (ˌdjuːəʊˈdiːnəm)
n , pl -na, -nums
the first part of the small intestine, between the stomach and the jejunum
[C14: from Medieval Latin, shortened from intestinum duodenum digitorum intestine of twelve fingers' length, from Latin duodēnī twelve each]

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Example sentences
Some evidence suggests that smoking delays the healing of gastric and duodenal ulcers.
They are effective only for duodenal ulcers, however.
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