say it: doo-AH-duh-nuhm
duodenum is a noun meaning "the part of the small intestine between the stomach and the jejunum". It carries one recorded sense.
the part of the small intestine between the stomach and the jejunum
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for duodenum come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.