The Collaborative International Dictionary of English v.0.48:

Hippodrome \Hip"po*drome\, n. [L. hippodromos, Gr. ?; "i`ppos
   horse + ? course, fr. ? to run: cf. F. hippodrome.]
   1. (Gr. Antiq.) A place set apart for equestrian and chariot
      races.
      [1913 Webster]

   2. An arena for equestrian performances; a circus.
      [1913 Webster]

   3. (Sports) A fraudulent contest with a predetermined winner.
      [Slang, U. S.]
      [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Hippodrome \Hip"po*drome\, v. i. [imp. & p. p. Hippodromed; p.
   pr. & vb. n. Hippodroming.] (Sports)
   To arrange contests with predetermined winners. [Slang, U.
   S.]
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

hippodrome
    n 1: a stadium for horse shows or horse races

Moby Thesaurus II by Grady Ward, 1.0:

58 Moby Thesaurus words for "hippodrome":
   agora, amphitheater, arena, athletic field, auditorium, background,
   bear garden, bowl, boxing ring, bull ring, campus, canvas, circus,
   cockpit, coliseum, colosseum, course, field, floor, forum, ground,
   gym, gymnasium, hall, lists, locale, marketplace, mat, milieu,
   open forum, palaestra, parade ground, pit, place, platform,
   precinct, prize ring, public square, purlieu, range, ring, scene,
   scene of action, scenery, setting, site, sphere, squared circle,
   stadium, stage, stage set, stage setting, terrain, theater,
   tilting ground, tiltyard, walk, wrestling ring