Hypertext Webster Gateway: "ballista"
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.
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