3.1.82
स्तन्भुस्तुन्भुस्कन्भुस्कुन्भुस्कुञ्भ्यः श्नुश्च
Operational rule vidhi
In presence of a सार्वधातुक प्रत्यय in the कर्तरि प्रयोग, the verbs स्तम्भ्, स्तुम्भ्, स्कम्भ्, स्कुम्भ्, स्कुञ् gets the श्ना or the श्नु विकरणप्रत्यय.
Word by word (padaccheda)
Left context स्तन्भु- स्तुन्भु- स्कन्भु- स्कुन्भु- स्कुञ्भ्यः pañcamī · bahuvacanaSubstitute / term नु ः prathamā · ekavacanaIndeclinable च avyaya
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
स्तन्भु-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
And there is the affix श्ना after स्तम्भ , स्तुम्भ , स्कम्भ or स्कुम्भ 'to hinder', to be dull or insensible' 'to support' and स्कु 'to go by leaps', as well as the affix श्नु , when a सार्वधातुक affix follows, in denoting the agent. (Note: The first 4 धातु are not found in the धातुपाठ and are found in the sūtras, and hence called सौत्र धातु ।)
As स्तभ्नाति or स्तभ्नोति, स्तुभ्नाति or स्तुभ्नोति, स्कभ्नाति or स्कभ्नोति, स्कुभ्नाति or स्कुभ्नोति, स्कुनाति or स्कुनोति. The first four of these roots are not found in the Dhatupatha and are to be found in the sutras, and hence called Sautra roots.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.