jest·er /ˈʤɛstɚ/
  講笑話的人,小丑
  Jest·er, n.
  1.  A buffoon; a merry-andrew; a court fool.
     This . . . was Yorick's skull, the king's jester.   --Shak.
     Dressed in the motley garb that jesters wear.   --Longfellow.
  2.  A person addicted to jesting, or to indulgence in light and amusing talk.
  He ambled up and down
  With shallow jesters.   --Shak.
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  jester
       n : a professional clown employed to entertain a king or
           nobleman in the middle ages [syn: fool, motley fool]