कत्र्यादिभ्यो ढकञ्

Operational rule vidhi

The affix ढकञ् (एयक) comes after the words कत्रि etc.

Word by word (padaccheda)

Left context कत्रि- आदिभ्यः pañcamī · bahuvacanaSubstitute / term ढकञ् 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.

Dotted words are technical terms. Hover or tap one to see its card.

Full reading

कत्रि-आदिभ्यः ढकञ्

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

Commentary

The affix ढकञ् (एयक) comes after the words कत्रि etc.
As कात्रेयकः, औम्भेयकः &c.

1 कत्रि, 2 उम्भि, 3 पुष्कर, 4 पुष्कल, 5 मोदन, 6 कुम्भी, 7 कुण्डिन, 8 नगरी (नगर) 9 माहिष्मती, 10 वर्मती, (चर्मण्वती) 11 उख्या, 12 ग्राम, 13 कुड्याया (कुल्याया) यलोपश्च, 14 वञ्जी, 15 भक्ति.

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