The Collaborative International Dictionary of English v.0.48:

Eupepsia \Eu*pep"si*a\, Eupepsy \Eu*pep"sy\, n. [NL. eupepsia,
   Fr. Gr. ?, fr. ? easy of digestion; e'y^ well + ? to cook,
   digest.] (Med.)
   Soundness of the nutritive or digestive organs; good
   concoction or digestion; -- opposed to dyspepsia.
   [1913 Webster]