The Collaborative International Dictionary of English v.0.48:

Funambulo \Fu*nam"bu*lo\, Funambulus \Fu*nam"bu*lus\n. [Sp.
   funambulo, or It. funambolo, fr. L. funambulus; funis rope
   (perh. akin to E. bind) + ambulare to walk. See Amble, and
   cf. Funambulist.]
   A ropewalker or ropedancer. [Obs.] --Bacon.
   [1913 Webster]