1. Probably a bastion of the citadel of Zion, at Jerusalem, mentioned in the history of David and Solomon, 2Sa 5:92Ki 12:201Ch 11:82Ch 32:5.
2. The name of a family or of a fortress at Shechem; in the latter case, the "house of Millo" would mean the garrison of that fortress, Jud 9:6.