COMMENT: A reliable common NC root. Somewhat problematic is the relationship of PN *=aš- 'to melt, to thaw' (Chech., Ing., Bacb. =aš-): if it is cognate (which is not very certain), we should reconstruct PNC *=ĭrc̣wĂr; see also PEC *=is_Vn-. Perhaps related is Urart. c̣i- 'to flow, to rain' (see Diakonoff-Starostin 1986, 44) - although semantically not very secure.
