Source : Webster's Revised Unabridged Dictionary (1913)

Gastroenteritis \Gas`tro*en`te*ri"tis\, n. [NL. See
   {Gastroenrteric}, and {-itis}.] (Med.)
   Inflammation of the lining membrane of the stomach and the
   intestines.

Source : WordNet®

gastroenteritis
     n : inflammation of the stomach and intestines; can be caused by
         Salmonella enteritidis [syn: {stomach flu}, {intestinal
         flu}]