ballista

Từ điển WordNet v3.1 - WordNet Dictionary

noun

an engine that provided medieval artillery used during sieges;
a heavy war engine for hurling large stones and other missiles
• Syn:
catapult, arbalest, arbalist, bricole, mangonel,
onager, trebuchet, trebucket
• Derivationally related forms:
catapultian (for: catapult), catapultic (for: catapult), catapult (for: catapult)
• Hypernyms:
engine