Boyd’s Bible Dictionary:
(noisy). A stream emptying into Dead Sea from the East, and boundary between the Amorites and Moabites (Num. 21:13; Judg. 11:18). Afterward between Moab and Israel (Deut. 2:24; Josh. 12:1; 13:9; Judg. 11:13).
Concise Bible Dictionary:
Ravine or wady with its mountain torrent, which formed the border between Moab and Ammon, now known as Wady Mojib. It has sources both north and south which unite, and its stream running nearly east and west, rushes through a deep ravine and falls into the Dead Sea at about its center north and south (Num. 21:13-28; Num. 22:36; Deut. 2:24, 36; Judg. 11:13-26; Isa. 16:2: Jer. 48:20).
Strong’s Dictionary of Hebrew Words:
Meaning:
or uArnon {ar-nohn'}; from 7442; a brawling stream; the Arnon, a river east of the Jordan, also its territory
Jackson’s Dictionary of Scripture Proper Names:
lion of perpetuity: I shall shout for joy
Potts’ Bible Proper Names:
Constant sounding; roaring; a brawling stream:―a river E. of Jordan, Num. 21:13. {Continuo sonans}