e'-ther (`ether; Ather):

A town in Judah (Joshua 15:42), near Libnah, assigned to Simeon (Joshua 19:7). Kh. el `Atr (identical in spelling with Ether) is possibly the site.

It is near Beit Jibrin and is described as "an ancient site:

cisterns, foundations, quarried rock and terraces" (PEF, III, 261, 279).

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Bibliography Information
Orr, James, M.A., D.D. General Editor. "Entry for 'ETHER'". "International Standard Bible Encyclopedia". 1915.