Millo in Fausset's Bible Dictionary

Hebrew "THE Millo." On taking the Jehusites' citadel David "built the city (Jerusalem) from the Millo round about" (2 Samuel 5:9; 1 Chronicles 11:8). Solomon raised his levy to repair Millo (1 Kings 9:15; 1 Kings 9:24; 1 Kings 11:27). So Hezekiah (2 Chronicles 32:5). It was part of "the city of David". (See JERUSALEM.) Septuagint translated Millo "the citadel." Probably an aboriginal term adopted by Israel. Near the Tyropoeon valley, dividing Jerusalem (2 Kings 12:20). Probably a tower; for in Judges 9:6; Judges 9:46; Judges 9:49 Millo is interchanged with Migdal, "a tower." The name may mean filling; it filled up (completed) the fortification of the city of David. On the N.W. corner of the wall, on the slope of the Tyropoeon valley, where Zion had least height and needed strengthening.