1. The first part of the small intestines, immediately following the stomach; the 12-inch intestine.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• duoderm,
• duodendum,
• dudenum,
• dodenum,
• suodenum,
• xuodenum,
• cuodenum,
• fuodenum,
• ruodenum,
• euodenum,
• dyodenum,
• dhodenum,
• djodenum,
• diodenum,
• d8odenum,
• d7odenum,
• duoednum,
• duodenumm,
• duodenem,
• duodenry

The adjective form of the word "duodenum" is "duodenal".