gastroenterologyPronunciation: /ˌgastrəʊɛntəˈrɒlədʒi/Definition of gastroenterology noun [mass noun] the branch of medicine which deals with disorders of the stomach and intestines. Derivatives gastroenterologicalPronunciation: /-rəˈlɒdʒɪk(ə)l/ adjective gastroenterologist noun gastroenterology in other Oxford dictionaries Definition of gastroenterology in the US English dictionary