The Collaborative International Dictionary of English v.0.48:
Epigastrium \Ep`i*gas"tri*um\, n. [NL., from Gr. ?.] (Anat.) The upper part of the abdomen. [1913 Webster]WordNet (r) 3.0 (2006):
epigastrium n 1: the region lying on or over the stomach (just below the sternum)