
1) Ancient catapult 2) Ancient Greek artillery 3) Ancient missile hurler 4) Ancient siege weapon 5) Arbalest 6) Arbalist 7) Artillery 8) Bricole 9) Catapult 10) Greek invention 11) Heavy weapon 12) Mangonel 13) Onager 14) Ordnance 15) Projectile weapon 16) Trebuchet 17) Trebucket
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https://www.crosswordclues.com/clue/ballista

1) Arbalest 2) Arbalist 3) Bricole 4) Mangonel 5) Onager 6) Trebuchet 7) Trebucket
Found on
https://www.crosswordclues.com/clue/ballista

The ballista (Latin, from Greek βαλλίστρα – ballistra and that from – βάλλω ballō, `throw`), plural ballistae, was an ancient missile weapon that launched a large projectile at a distant target. The earliest mention of ballista in literature occurs in the Bible, as invented and used under the reign of king Uzziah. II Chronicle.....
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http://en.wikipedia.org/wiki/Ballista

A castle siege engine shaped like a large crossbow, for shooting large arrows.
Found on
http://great-castles.com/glossary.php

Catapult resembling a very large crossbow (also spelled ballistra)
Found on
http://homeworkhelp.stjohnssevenoaks.com/glossary.htm

• (n.) An ancient military engine, in the form of a crossbow, used for hurling large missiles.
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http://thinkexist.com/dictionary/meaning/ballista/

ancient missile launcher designed to hurl javelins or heavy balls. Ballistas were powered by torsion derived from two thick skeins of twisted cords ... [2 related articles]
Found on
http://www.britannica.com/eb/a-z/b/12

early missile weapons resembling large crossbow on a carriage, firing metal bolts, arrows or stone slugs
Found on
http://www.castles-of-britain.com/glossary.htm

Torsion gun.
Found on
http://www.encyclo.co.uk/local/20764

siege engine taking the form of a giant crossbow, mounted on a stand
Found on
http://www.encyclo.co.uk/local/22129

The ballista was a term used for a siege engine which used a torsion engine (tormentum) driving 2 horizontally opposed arms rotating in the horizontal plane to hurl objects or shoot bolts. It was like a large crossbow and powered by the torsion resulting from 2 wooden arms thrust into 2 thick skeins of twisted cords made of horsehair, gut, sinew, o…...
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http://www.encyclo.co.uk/visitor-contributions.php
Bal·lis'ta noun ;
plural Ballistæ [ Latin
ballista ,
balista , from Greek
ballein to throw.] An ancient military engine, in the form of a crossbow, used for hurling large missiles.
Found on
http://www.encyclo.co.uk/webster/B/9

A larger cross-bow of the middle ages that had the capacity to fire larger rocks.
Found on
https://legendarchery.com/pages/archery-terms-glossary

(Latin) a high powered crossbow that hurled missiles long distances and could pierce armor.
Found on
https://www.encyclo.co.uk/local/10135

siege engine taking the form of a giant crossbow, mounted on a stand
Found on
https://www.encyclo.co.uk/local/20402

artillery- weapon discharging arrows and stone balls
Found on
https://www.encyclo.co.uk/local/20434

A very large medieval crossbow used by an army attacking the walls of a besieged town. This crossbow was capable of firing large rocks and spears long distances.
Found on
https://www.greygoosearchery.co.uk/the-a-to-z-of-archery-terms/
No exact match found.