arba

{ } n. [ OF. arbaleste, LL. arbalista, for L. arcuballista; arcus bow + ballista a military engine. See Ballista. ] (Antiq.) A crossbow, consisting of a steel bow set in a shaft of wood, furnished with a string and a trigger, and a mechanical device for bending the bow. It served to throw arrows, darts, bullets, etc. [ Written also arbalet and arblast. ] Fosbroke. [ 1913 Webster ]