Source : Webster's Revised Unabridged Dictionary (1913)

Sufferer \Suf"fer*er\, n.
   1. One who suffers; one who endures or undergoes suffering;
      one who sustains inconvenience or loss; as, sufferers by
      poverty or sickness; men are sufferers by fire or by
      losses at sea.

   2. One who permits or allows.

Source : WordNet®

sufferer
     n 1: a person suffering from an illness [syn: {sick person}, {diseased
          person}]
     2: one who suffers for the sake of principle [syn: {martyr}]