6.1.79
वान्तो यि प्रत्यये
Operational rule vidhi
An ओकार and an औकार are respectively converted to अव् and आव् when followed by a यकारादि प्रत्यय, in the context of संहिता.
Word by word (padaccheda)
Substitute / term वान्तः prathamā · ekavacanaRight context यि saptamī · ekavacanaRight context saptamī · ekavacana
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
- Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").
Dotted words are technical terms, dashed ones pratyāhāras (names for classes of sounds or affixes). Hover or tap one to see its card.
Full reading
वान्तः यि
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The substitution of अव् and आव् for ओ and औ also takes place before an affix beginning with य।
The वान्त are those which end in व् viz. अव् and आव् ॥ Of the four substitutes taught in the preceding sutra, those which end in व् (viz. अव् and आव्) also come when an affix with an initial य follows. It follows that the substituted letters must be ओ and औ ॥ Thus बभ्रु + यञ् = बाभ्रो + य = बाभ्रव्यः 6.4.146 and (IV. I.I05). So also माण्डव्यः, शंकव्यंदारु, पिचव्यः कार्पासः, नाव्यो 4.4.91 हृदः ॥ Why do we say "अव् and आव्"? Observe रायमिच्छति = रैयति, no change of ऐ before य ॥ Why do we say "before य"? Observe गोभ्याम्, नौभ्याम् ॥ Why do we say "an affix"? Observe गोयानम्, नौयानम् ॥
Vart:- The word गो is changed before यूति in the Vedas. As गो + यूति = गव्यूति, as आनो मित्रा वरुणा घृतैर्गव्यूतिमुक्षतम् ॥ Why do we say in the Vedas? Observe गोयूतिः ॥
Vart:- This substitution takes place when referring to the measure of a road:- as, गव्यूति मात्रमध्वानं गतः ॥ This is in the secular literature, गव्यूति meaning क्रोशयुगम् ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.