IPA: /ˌdjuːəˈdiːnəl/
KK: /duˈoʊdɪnəl/
Relating to the first section of the small intestine, known as the duodenum.
The doctor explained that the duodenal ulcer was causing the patient's pain.
Duodenal → It is formed from "duodeni" (from Latin, meaning twelve) and "-al" (meaning pertaining to). The word "duodenal" refers to something that pertains to the twelve, specifically the first twelve inches of the small intestine, known as the duodenum.
Think of the Latin word for twelve, 'duodeni', to remember that 'duodenal' relates to the first twelve inches of the small intestine.
No commonly confused words.