Source : Webster's Revised Unabridged Dictionary (1913)

Simulacrum \Sim`u*la"crum\, n.; pl. {Simulacra}. [L. See
   {Simulate}.]
   A likeness; a semblance; a mock appearance; a sham; -- now
   usually in a derogatory sense.

         Beneath it nothing but a great simulacrum. --Thackeray.

Source : WordNet®

simulacrum
     n 1: an insubstantial or vague semblance
     2: a representation of a person (especially in the form of
        sculpture); "the coin bears an effigy of Lincoln"; "the
        emperor's tomb had his image carved in stone" [syn: {effigy},
         {image}]
     [also: {simulacra} (pl)]