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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Ballista  \Bal*lis"ta\,  n.;  pl  {Ballist[ae]}.  [L.  ballista, 
  balista,  fr  Gr  ?  to  throw.] 
  An  ancient  military  engine,  in  the  form  of  a  crossbow,  used 
  for  hurling  large  missiles.