conc▪ [v1] : From Pers ʔušnān~ʔišnān ‘the herb alkali, and the ashes which are made from it, with which they wash clothes and the hands after eating’ (Steingass1892).
▪ [v2] : (Rolland2014a:) From Pers ʔušna »‘lichen, algue, mousse, usnée’. Peut-être apparanté à [v1] ‘potass (Salsola kali)’«.