ऋन्नेभ्यो ङीप्

Operational rule vidhi

To indicate the feminine property, the ऋकारान्त and the नकारान्त words get the ङीप्-प्रत्यय.

Word by word (padaccheda)

Left context ऋत्- नेभ्यः pañcamī · bahuvacanaSubstitute / term ङीप् prathamā · ekavacana

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.

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Full reading

ऋत्-नेभ्यः ङीप्

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The affix ङीप् is used in forming the feminine after प्रातिपदिक (Nominal Stem) ending in ऋ or न्।
Of the affix ङीप्, the letter ङ् is taken in order to make a common term with ङीष् and ङीन्; and the प् is taken to distinguish ti from those affixes; the real affix is ई । Thus, कर्तृ;-- f. कर्त्री; हर्तृ—f. हर्त्री; दण्डिन्—f. दण्डिनी; छत्रिन्,-- f. छत्रिनी ॥

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.