Boyd’s Bible Dictionary:
(flowing). A tributary of Jordan, on east side; and northern boundary of Ammon (Gen. 32:22; Num. 21:24; Deut. 2:37).
Concise Bible Dictionary:
Wady Zerka – The Jabbok
Stream on the east of the Jordan, near to which the angel wrestled with Jacob. It was afterward called “the border of the children of Ammon” (Gen. 32:22; Num. 21:24; Deut. 2:37; Deut. 3:16; Josh. 12:2; Judg. 11:13,22). In some parts it runs in a deep ravine, and in winter is impassable in places. It enters the Jordan about 32° 6' N, and is now called Wady Zerka.
Strong’s Dictionary of Hebrew Words:
Meaning:
probably from 1238; pouring forth; Jabbok, a river east of the Jordan
Jackson’s Dictionary of Scripture Proper Names:
he will empty out
Potts’ Bible Proper Names:
With the constant murmur of the water; flowing:―a tributary of Jordan, Gen. 32:22. {Cum continuo murmure aquae}