The Collaborative International Dictionary of English v.0.48:

Victim \Vic"tim\, n. [L. victima: cf. F. victime.]
   1. A living being sacrificed to some deity, or in the
      performance of a religious rite; a creature immolated, or
      made an offering of.
      [1913 Webster]

            Led like a victim, to my death I'll go. --Dryden.
      [1913 Webster]

   2. A person or thing destroyed or sacrificed in the pursuit
      of an object, or in gratification of a passion; as, a
      victim to jealousy, lust, or ambition.
      [1913 Webster]

   3. A person or living creature destroyed by, or suffering
      grievous injury from, another, from fortune or from
      accident; as, the victim of a defaulter; the victim of a
      railroad accident.
      [1913 Webster]

   4. Hence, one who is duped, or cheated; a dupe; a gull.
      [Colloq.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

victim
    n 1: an unfortunate person who suffers from some adverse
         circumstance
    2: a person who is tricked or swindled [syn: victim, dupe]

Moby Thesaurus II by Grady Ward, 1.0:

85 Moby Thesaurus words for "victim":
   also-ran, babe, beasts of venery, big game, boob, booby, butt,
   byword, byword of reproach, casualty, chump, cinch,
   credulous person, cull, defeatee, derision, duck, dupe, easy mark,
   easy pickings, fair game, fall guy, figure of fun, fish, fool,
   game, game loser, gazingstock, goat, gobe-mouches, good loser,
   good sport, greener, greenhorn, greeny, gudgeon, gull,
   hard-luck guy, hardcase, innocent, jest, jestingstock, joke, kill,
   laughingstock, leadpipe cinch, loser, mark, martyr, mockery,
   monkey, object of compassion, offering, patsy, pigeon, plaything,
   poor devil, poor unfortunate, prey, prize sap, pushover, quarry,
   sacrifice, sad sack, sap, saphead, scapegoat, schlemiel,
   schlimazel, sitting duck, sport, stock, stooge, sucker, sufferer,
   sure loser, target, the hunted, the vanquished, toy, trusting soul,
   underdog, unfortunate, venery, wretch