B / ballistārĭus
noun

ballistārĭus

gen. ballistārii · gender masculine · decl. 2nd
(; and in Gloss. ), , 1. ballista.
A maker of ballistœ
A maker of ballistœ, Dig. 50, 6, 6: COLLEGIVM BALLISTARIORVM., Inscr. Orell. 4066.—
One who discharges the ballista; a slinger
One who discharges the ballista, a slinger, Veg. Mil. 2, 2; Amm. 16, 2, 5.