вал - Wiktionary
2019-2-24 · девя́тый вал (devjátyj val) References . Vasmer (Fasmer), Max (Maks) (1964–1973), “ вал ”, in Etimologičeskij slovarʹ russkovo jazyka [Etymological Dictionary of the Russian Language] (in Russian), translated from German and supplemented by Trubačóv Oleg, Moscow: Progress
