पात्राद्घंश्च

Operational rule vidhi

The affix घञ् (-/- इयं) together with यत् (यं) comes in the sense of 'deserving that' after the word पात्र.

Word by word (padaccheda)

Left context पात्रात् pañcamī · ekavacanaSubstitute / term घन् prathamā · ekavacanaIndeclinable च avyaya

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.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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Full reading

पात्रात् घन् च

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

Commentary

The affix घञ् (-/- इयं) together with यत् (यं) comes in the sense of 'deserving that' after the word पात्र।
This debars ठक् and ठञ् ॥ The word पात्र denotes measure also. Thus पात्रमर्हति = पात्र्यः or पात्रियः ॥

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