ballista
/bəˈlɪstə/noun
(pl. ballistae /-stiː/ 或ballistas)
1- a catapult used in ancient warfare for hurling large stones（古代战争中发射石弹的）弩炮, 投石器。
1.1
- a large crossbow for firing a spear（发射梭镖的）弩, 石弓。
词源
early 16th cent.: from Latin， based on Greek ballein 'to throw'.