a powerful medieval crossbow with a steel bow, used to shoot stones, metal balls, arrows, etc.
Also, ar·ba·list.
Origin: before 1100; < Old French arbaleste < Old Provençal < Late Latin arcuballista (see arc, ballista); replacing Middle English, late Old English arblast < Old French
"crossbow," c.1100, from O.Fr. arbaleste (Mod.Fr. arbalète-), from V.L. arbalista, from L.L. arcuballista "catapult," from L. arcus "bow" (see arc) + ballista "machine for throwing projectiles" (see ballistic). Ger. armbrust is from the same Fr. word but mangled by folk etymology.