in Ancient Geography, the metropolis of Moab, in Arabia Petrae (Moses), and the royal residence, situated on the east side of the river Arnon. It was called also Rabba (Joshua): and to distinguish it from Rabba of the Ammonites, Rabbat Moab, and on coins Rabboth Moma (Reland). Eusebius says it was called Areopolis in his time, from Ar and Polis. The inhabitants are called Areopolitæ. St Jerome says that this city was entirely destroyed by an earthquake when he was a young man.

ARA THURIBULI, the altar of incense, in Astronomy, a southern constellation, not visible in our hemisphere, consisting, according to Ptolemy, of seven stars; and according to Sharp's Catalogue, annexed to that of Mr Flamsted, of nine stars.