The Collaborative International Dictionary of English v.0.48:

Gastroduodenitis \Gas`tro*du`o*de*ni"tis\, n. [NL. See
   Gastroduodenal, and -itis.] (Med.)
   Inflammation of the stomach and duodenum. It is one of the
   most frequent causes of jaundice.
   [1913 Webster]