Engine
Smith's Dictionary
a term applied exclusively to military affairs in the Bible. The engines to which the term is applied in (2 Chronicles 26:15) were designed to propel various missiles from the walls of the besieged town. One, with which the Hebrews were acquainted, was the battering ram, described in (Ezekiel 26:9) and still more precisely in (Ezekiel 4:2; 21:22)
International Standard Bible Encyclopedia
en'-jin (2Ch 26:15; Eze 26:9; /APC 1Macc 6:51; 13:43 f).
See SIEGE.