7.1.81
शप्श्यनोर्नित्यम्
Operational rule vidhi
When the affix शतृ (अत्-अन्त्) comes after a verbal अङ्ग (stem) ending in विकरण-s शप् and श्यन् it invariably takes the augment नुम् before the Neutral शी (ई) and the feminine ending ई (नदी).
Word by word (padaccheda)
Target शप्- श्यनोः ṣaṣṭhī · dvivacanaSubstitute / term नित्यम् prathamā · ekavacana
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Dotted words are technical terms. Hover or tap one to see its card.
Full reading
शप्-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
शप्-
Replace śap-śyanoḥ with nityam. Inherited words (anuvṛtti) may add further conditions.
Commentary
When the affix शतृ (अत्-अन्त्) comes after a verbal अङ्ग (stem) ending in विकरण-s शप् and श्यन् it invariably takes the augment नुम् before the Neutral शी (ई) and the feminine ending ई (नदी).
Thus पचन्ती कुले, पचन्ती ब्राह्मणी, दीव्यन्ती कुले, दीव्यन्ती ब्राह्मणी, सीव्यन्ती कुले, सीव्यन्ती ब्राह्मणी ॥ The word नित्य stops the anuvritti of वा 7.1.79.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.