Ar. (a city). Ar or Ar of Moab, one of the chief places of Moab. Numbers 21:28; Isaiah 15:1. In later times, the place known as Areopolis and Rabbath-Moab. The site still called Rabba. It lies about halfway between Kerak and the Wady Mojeb, 10 or 11 miles from each, the Roman road passing through it.