Source : Webster's Revised Unabridged Dictionary (1913)

Mangonel \Man"go*nel\, n. [OF. mangonel, LL. manganellus,
   manganum, fr. Gr. ? See {Mangle}, n.]
   A military engine formerly used for throwing stones and
   javelins.

Source : WordNet®

mangonel
     n : medieval artillery used during sieges; a heavy war engine
         for hurling large stones and other missiles [syn: {catapult},
          {arbalest}, {arbalist}, {ballista}, {bricole}, {onager},
          {trebuchet}, {trebucket}]