Source : Webster's Revised Unabridged Dictionary (1913)

Taleteller \Tale"tell`er\, n.
   One who tells tales or stories, especially in a mischievous
   or officious manner; a talebearer; a telltale; a tattler.

Source : WordNet®

taleteller
     n : someone who gossips indiscreetly [syn: {tattletale}, {tattler},
          {talebearer}, {telltale}, {blabbermouth}]