An Etymological Dictionary of Astronomy and Astrophysics

Etymology (EN): L. ara “fire altar,” from PIE as- “to burn”.

Etymology (PE): Âtašdân “a hearth, a fire-place; a movable coal grate,” from
âtaš “fire” (from Mid.Pers. âtaxš, âzar-, O.Pers. *âtar-, Av. âtar-, from Indo-Iranian *âtar-, compare with L. âter (feminine âtra) “black” (from “blackened by fire”); PIE *âter) + -dân suffix denoting recipient.