Millo

Strong’s Dictionary of Hebrew Words:

Transliteration:
millow’
Phonic:
mil-lo’
Meaning:
or mil-loe (2 Kings 12:20) {mil-lo'}; from 4390; a rampart (as filled in), i.e. the citadel
KJV Usage:
Millo. See also 1037

Jackson’s Dictionary of Scripture Proper Names:

a fill (earthwork)

Potts’ Bible Proper Names:

Fortification; rampart; entrenchment; a bastion:―name of a place and of a family, 2 Sam. 5:9. {Munimentum}