gas·tro·en·ter·ol·o·gy 
(găs′trō-ĕn′tə-rŏlə-jē)
(găs′trō-ĕn′tə-rŏlə-jē)n.
The branch of medicine that deals with the diagnosis and treatment of diseases and disorders of the digestive system.
gas′tro·en′ter·o·logic (-ə-lŏjĭk), gas′tro·en′ter·o·logi·cal adj.
gas′tro·en′ter·olo·gist n.