an old army motor in the shape of a crossbow used for hurling big missiles
- an engine that supplied medieval artillery used during sieges; much war motor for hurling large rocks alongside missiles
- an old armed forces motor, in the form of a crossbow, used for hurling huge missiles.
ancient war engine, belated 14c., from Latin ballista, literally "a throwing machine," from Greek ballein "to put" (see ballistics).
(letter.) An ancient armed forces engine, by means of a crossbow, used for hurling huge missiles.
Long by I broad, the Ballista Islets, and farther north the three famous Chincha Islands, whose vast guano deposits are now exhausted.