Definition of gastrointestinal adjective from the Oxford Advanced Learner's Dictionary

 

gastrointestinal

 adjective
adjective
BrE BrE//ˌɡæstrəʊɪnˈtestɪnl//
 
, also BrE//ˌɡæstrəʊɪnteˈstaɪnl//
 
; NAmE NAmE//ˌɡæstroʊɪnˈtestɪnl//
 
(medical)
 
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of or related to the stomach and intestines
See the Oxford Advanced American Dictionary entry: gastrointestinal