Source : Webster's Revised Unabridged Dictionary (1913)

Paranoiac \Par`a*noi"ac\, a. (Med.)
   Of or pertaining to paranoia; affected with, or
   characteristic of, paranoia.

Paranoiac \Par`a*noi"ac\, n.
   A person affected with paranoia.

Source : WordNet®

paranoiac
     n : a person afflicted with paranoia [syn: {paranoid}]