eques·tri·an /ɪˈkwɛstriən/
  (a.)騎馬的,馬的,在馬背上的騎手
  E·ques·tri·an a.
  1. Of or pertaining to horses or horsemen, or to horsemanship; as, equestrian feats, or games.
  2. Being or riding on horseback; mounted; as, an equestrian statue.
     An equestrian lady appeared upon the plains.   --Spectator.
  3. Belonging to, or composed of, the ancient Roman equities or knights; as, the equestrian order.
  E·ques·tri·an, n. One who rides on horseback; a horseman; a rider.
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  equestrian
       adj 1: of or relating to or composed of knights
       2: of or relating to or featuring horseback riding
       n : a man skilled in equitation [syn: horseman, horseback
           rider]