gastrointestinalPronunciation: /ˌgastrəʊɪnˈtɛstɪn(ə)l, -ɪntɛsˈtʌɪn(ə)l/Definition of gastrointestinal adjective relating to the stomach and the intestines: ginger soothes the gastrointestinal tract gastrointestinal disordersgastrointestinal in other Oxford dictionaries Definition of gastrointestinal in the US English dictionary