The labialisation in PA is secondary (Av. and all other languages clearly reflect *-š-), probably under the labialising influence of *w-. The word is ultimately of Indo-European (Indo-Iranian) origin, cf. IE *u_ers- 'male, male animal' ( > Old Ind. vṛṣa- 'bull' etc.), see Старостин 1988, 113.
| Help | ||||||
|