Boyd’s Bible Dictionary:
(city). A chief place of Moab (Num. 21:28; Isa. 15:1). Aroer (Deut. 2:36). Used to type the Moabite people or land (Deut. 2:9,18,29).
Concise Bible Dictionary:
A chief city in the Moabite territory. In Jerome’s time it was called Areopolis. It is identified with Rabba, 31° 19' N, 35° 38' E, about 10 miles from the Dead Sea (Num. 21:15, 28; Isa. 15:1). In other passages the name Ar appears to include the land of the Moabites (Deut. 2:9,18,29).
Strong’s Dictionary of Hebrew Words:
Meaning:
the same as 5892; a city; Ar, a place in Moab
Jackson’s Dictionary of Scripture Proper Names:
awaking
Potts’ Bible Proper Names:
A city; awakening; uncovering:―a place in Moab, Num. 21:15. {Urbs}