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770. A final vowel of a root

On the other hand, a final vowel of a root is in general liable to the same changes as in other parts of the verbal system where it is followed by y: thus —

a. Final i and u are lengthened: thus, mīyá from √misūyá from √su;

b. Final ā is usually changed to ī: thus, dīyá from √hīyá from √: but jñāyá from √jñā, and so khyāyákhāyámnāyá, etc.;

c. Final  is in general changed to ri: thus, kriyá from √kṛ; but if preceded by two consonants (and also, it is claimed, in the root ), it has instead the guṇa-strengthening: thus, smaryáfrom √smṛ (the only quotable case); — and in those roots which show a change of  to ir and ur (so-called -verbs: see 242), that change is made here also, and the vowel is lengthened: thus, çīrya from √çṛpūryá from √pṛ.