noun. a physician who specializes in diseases of the gastrointestinal tract.
1. Noun, singular or mass There aren't really foods that stop diarrhea, says Randy Meisner, MD, a gastroenterologist with Spectrum Health in Grand Rapids, Michigan, but certain foods can help clear it up. 2. Verb, base form Prune juice may help alleviate irritable bowel syndrome symptoms as well as other bowel disorders, according to gastroenterologist Dr. Purushothaman Premchand.