Source : Webster's Revised Unabridged Dictionary (1913)

Epigastrium \Ep`i*gas"tri*um\, n. [NL., from Gr. ?.] (Anat.)
   The upper part of the abdomen.

Source : WordNet®

epigastrium
     n : the region lying on or over the stomach (just below the
         sternum)
     [also: {epigastria} (pl)]