Concise Bible Dictionary:

1. One of the chief towns of Bashan, where Og was defeated by the Israelites (Num. 21:33-3533And they turned and went up by the way of Bashan: and Og the king of Bashan went out against them, he, and all his people, to the battle at Edrei. 34And the Lord said unto Moses, Fear him not: for I have delivered him into thy hand, and all his people, and his land; and thou shalt do to him as thou didst unto Sihon king of the Amorites, which dwelt at Heshbon. 35So they smote him, and his sons, and all his people, until there was none left him alive: and they possessed his land. (Numbers 21:33‑35); Deut. 1:44After he had slain Sihon the king of the Amorites, which dwelt in Heshbon, and Og the king of Bashan, which dwelt at Astaroth in Edrei: (Deuteronomy 1:4); Deut. 3:1,101Then we turned, and went up the way to Bashan: and Og the king of Bashan came out against us, he and all his people, to battle at Edrei. (Deuteronomy 3:1)
10All the cities of the plain, and all Gilead, and all Bashan, unto Salchah and Edrei, cities of the kingdom of Og in Bashan. (Deuteronomy 3:10)
; Josh. 12:44And the coast of Og king of Bashan, which was of the remnant of the giants, that dwelt at Ashtaroth and at Edrei, (Joshua 12:4); Josh. 13:12,3112All the kingdom of Og in Bashan, which reigned in Ashtaroth and in Edrei, who remained of the remnant of the giants: for these did Moses smite, and cast them out. (Joshua 13:12)
31And half Gilead, and Ashtaroth, and Edrei, cities of the kingdom of Og in Bashan, were pertaining unto the children of Machir the son of Manasseh, even to the one half of the children of Machir by their families. (Joshua 13:31)
). It fell to the lot of Manasseh. It is identified with ed Deraah, 32° 38' N, 36° 6' E. It is a place of great natural strength, being surrounded by a labyrinth of clefts and crevasses in the rock. The houses are of stone, with stone roofs and stone doors. There is no water there, and the spot seems chosen for security. About 50 families of desperate character inhabit the place. Underneath the city are many large caves, forming a subterranean city, with streets and houses; but a recent traveler found the entrance blocked by a rock, and was told that the passage had been blown up to prevent the caves being used as a hiding place from justice.
2. City of Naphtali in the north, near Kedesh (Josh. 19:3737And Kedesh, and Edrei, and En-hazor, (Joshua 19:37)). Identified by some with Yater, 33° 9' N, 35° 20' E.

Strong’s Dictionary of Hebrew Words:

from the equivalent of 153; mighty; Edrei, the name of two places in Palestine
KJV Usage:

Jackson’s Dictionary of Scripture Proper Names:

goodly pasture

Potts’ Bible Proper Names:

Sufficient pasturage; plantation; strong; mighty:―name of two places in Palestine, Num. 21:33. {Amplum pascuum}