The Collaborative International Dictionary of English v.0.48:

Ropedancer \Rope"dan`cer\, n.
   One who dances, walks, or performs acrobatic feats, on a rope
   extended through the air at some height. -- Rope"dan`cing,
   n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ropedancer
    n 1: an acrobat who performs on a rope stretched at some height
         above the ground [syn: ropewalker, ropedancer]