Source : Webster's Revised Unabridged Dictionary (1913)

Dyspepsia \Dys*pep"si*a\, Dyspepsy \Dys*pep"sy\ (?; 277), [L.
   dyspepsia, Gr. ?, fr. ? hard to digest; ? ill, hard + ? to
   cook, digest; akin to E. cook: cf. F. dyspepsie. See {Dys-},
   and 3d Cook.] (Med.)
   A kind of indigestion; a state of the stomach in which its
   functions are disturbed, without the presence of other
   diseases, or, if others are present, they are of minor
   importance. Its symptoms are loss of appetite, nausea,
   heartburn, acrid or fetid eructations, a sense of weight or
   fullness in the stomach, etc. --Dunglison.

Source : WordNet®

dyspepsia
     n : a disorder of digestive function characterized by discomfort
         or heartburn or nausea [syn: {indigestion}, {stomach
         upset}, {upset stomach}]