treb·u·chet /ˌtrɛbjəˈʃɛt, bə, ˈʧɛt/
  中世的拋石機,小型秤,小天平
  Treb·u·chet Tre·buck·et n.
  1. A cucking stool; a tumbrel.
  2. A military engine used in the Middle Ages for throwing stones, etc.  It acted by means of a great weight fastened to the short arm of a lever, which, being let fall, raised the end of the long arm with great velocity, hurling stones with much force.
  3. A kind of balance for weighing. [Obs.]
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  trebuchet
       n : medieval artillery used during sieges; a heavy war engine
           for hurling large stones and other missiles [syn: catapult,
            arbalest, arbalist, ballista, bricole, mangonel,
            onager, trebucket]