BALLISTA
catapult, arbalest, arbalist, ballista, bricole, mangonel, onager, trebuchet, trebucket
(noun) an engine that provided medieval artillery used during sieges; a heavy war engine for hurling large stones and other missiles
Source: WordNet® 3.1
Etymology
Noun
ballista (plural ballistas or ballistae or ballistæ)
An ancient military engine, in the form of a crossbow, used for hurling large missiles.
Source: Wiktionary
Bal*lis"ta, n.; pl. Ballist. Etym: [L. ballista, balista, fr. Gr. to
throw.]
Definition: An ancient military engine, in the form of a crossbow, used for
hurling large missiles.
Source: Webster’s Unabridged Dictionary 1913 Edition