rha·son noun orra·son\ˈräˌsȯn\ (-s) Etymology: Middle Greek rhason, a napless woolen cloth, rhason, perhaps from Latin rasus, past participle of radere to scrape, scratch, shave — more at rat Eastern Church 1.: an ecclesiastical garment resembling the cassock 2.: a long loose cloak worn over the rhason — called also exorhason