The Collaborative International Dictionary of English v.0.48:

Dyspeptic \Dys*pep"tic\, Dyspeptical \Dys*pep"tic*al\, a.
   Pertaining to dyspepsia; having dyspepsia; as, a dyspeptic or
   dyspeptical symptom.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dyspeptic \Dys*pep"tic\, n.
   A person afflicted with dyspepsia.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dyspeptic
    adj 1: suffering from dyspepsia
    2: irritable as if suffering from indigestion [syn:
       atrabilious, bilious, dyspeptic, liverish]
    n 1: a person suffering from indigestion