A military engine for battering walls. A long and solid beam, armed at one end with a metallic ram's-head, was suspended by the middle, and swung violently and repeatedly against the walls of a city or castle, till a breach was made. It was sometimes in the lower part of a wooden tower built upon wheels, and was worked by more than a hundred men; while the upper part of the tower was filled with archers and slingers, Ezekiel 4:2; 21:22 .