महाराजप्रोष्ठपदाट्ठञ्

Operational rule vidhi

The words 'महाराज' and 'प्रोष्ठपद' get the प्रत्यय ठञ् in the meaning of 'सा अस्य देवता'.

Word by word (padaccheda)

Left context महाराज- प्रोष्ठपदात् pañcamī · ekavacanaSubstitute / term 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.

Pink letters are it-markers (anubandhas), tags dropped by 1.3.9. Hover or tap one for the rule that marks it, or try the it-letter finder.

Full reading

महाराज-प्रोष्ठपदात् ठञ्

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

Commentary

The affix ठञ् comes in the sense of 'this its deity' after the words 1. महाराज and 2. प्रोष्ठपद।
Thus महाराजो देवताऽस्य = महाराजिकम्, प्रौष्ठपदिकम् ॥

Vart:- After the words नवयज्ञ &c the affix ठञ् comes in the sense of 'that exists in it'. As नवयज्ञोऽस्मिन् वर्तते = नावयज्ञिकः कालः ॥ So also पाकयज्ञिकः &c.

Vart:- After the word पूर्णमास, the affix अण् comes in the same sense. As पूर्णमासोऽस्यां वर्तते = पौर्णमासी तिथिः 'the day in which the full-moon occurs.'

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