(double ornament), a town belonging to Judah, lying in the low country, and named, between Sharaim and hag-Gederah, in (Joshua 15:36) only.
International Standard Bible Encyclopedia
ad-i-tha'-im (`adhithayim "double ornament, passage, or prey"): A city in "the lowland" (Shephelah, not as the KingJamesVersion "valley") of Judah (Jos 15:36). Site unknown, but possibly same as ADIDA (which see).