The Collaborative International Dictionary of English v.0.48:

Trickster \Trick"ster\, n.
   One who tricks; a deceiver; a tricker; a cheat.
   [1913 Webster]

WordNet (r) 3.0 (2006):

trickster
    n 1: someone who plays practical jokes on others [syn:
         prankster, cut-up, trickster, tricker, hoaxer,
         practical joker]
    2: someone who leads you to believe something that is not true
       [syn: deceiver, cheat, cheater, trickster,
       beguiler, slicker]
    3: a mischievous supernatural being found in the folklore of
       many primitive people; sometimes distinguished by prodigious
       biological drives and exaggerated bodily parts