पादोऽन्यतरस्याम्

Operational rule vidhi

The affix ङीप् is optionally used in the feminine after a प्रातिपदिक (Nominal Stem) ending with the word पाद्.

Word by word (padaccheda)

Left context पादः pañcamī · ekavacanaRight context अन्यतरस्याम् saptamī · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
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").

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Full reading

पादः अन्यतरस्याम्

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 optionally used in the feminine after a प्रातिपदिक (Nominal Stem) ending with the word पाद्।
The word पाद becomes पाद् when final in certain Bahuvrihi compounds 5.4.140. Thus द्विपात् is both masculine and feminine, or it may optionally form its feminine by long ई (ङीप्). In the latter alternative, the form will be द्विपदी, the word पाद् being replaced by पद् by 6.4.130, (as read with 1.4.18). Similarly त्रिपात् or त्रिपदी; चतुष्पाद् or चतुष्पदी ॥

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