ringmaster

from WordNet (r) 3.0 (2006)

ringmaster
    n 1: the person in charge of performances in a circus ring

from The Collaborative International Dictionary of English v.0.48

Ringmaster \Ring"mas`ter\, n.
   One in charge of the performances (as of horses) within the
   ring in a circus.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

46 Moby Thesaurus words for "ringmaster":
      MC, acrobat, aerialist, auteur, ballyhoo man, bareback rider,
      barker, callboy, circus artist, clown, costume designer, costumer,
      costumier, director, emcee, equestrian director, equilibrist,
      exhibitor, flier, high-wire artist, impresario, juggler,
      lion tamer, makeup man, master of ceremonies, playreader, producer,
      prompter, scenewright, set designer, showman, slack-rope artist,
      snake charmer, spieler, stage director, stage manager,
      sword swallower, theater man, theatrician, ticket collector,
      tightrope walker, trapeze artist, tumbler, usher, usherer,
      usherette