bal·lis·ta /bəˈlɪstə/
發射石頭的古代武器
Bal·lis·ta n.; pl. Ballistæ An ancient military engine, in the form of a crossbow, used for hurling large missiles.
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ballista
n : 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]
[also: ballistae (pl)]