8.4.23
वमोर्वा
Operational rule vidhi
When the word हन् comes after an उपसर्ग containing a रेफ, and when the नकार of हन् is preceded by a ह्रस्व अकार, this नकार is optionally converted to णकार in presence of a प्रत्यय that begins with a वकार or a मकार.
Word by word (padaccheda)
Right context वमोः saptamī · dvivacanaIndeclinable वा avyaya
- 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").
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
वमोः वा
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
Optionally when व or म follow, the न of हन् is changed to ण , when preceded by an उपसर्ग competent to cause the change.
Thus प्रहण्वः, परिहण्वः, or प्रहन्वः and परिहन्वः, प्रहण्मः or प्रहन्मः परिहण्मः or परिहन्मः ॥
This sutra enjoins an option in certain cases, where it would have been obligatory by the last rule.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.