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Published online by Cambridge University Press: 22 April 2026
Indo-Iranian ∗-rt- is represented in Avestan sometimes as /Ř/ (written š), sometimes as rt. It is maintained that /Ř/ is the normal phonological reflex of ∗-rt-, and that rt has been restored according to Kuryłowicz's ‘Fourth Law of Analogy’ in motivated categories where there was still awareness of a morpheme boundary between the /r/ and the /t/.