मातृष्वसुश्च

Operational rule vidhi

So also after the word मातृष्वसृ the affix छण् is added and the final is elided when ढक् follows in forming Patronymic.

Word by word (padaccheda)

Left context मातृष्वसुः pañcamī · 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.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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

Full reading

मातृष्वसुः च

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

Commentary

So also after the word मातृष्वसृ the affix छण् is added and the final is elided when ढक् follows in forming Patronymic.
The Sutras 4.1.132, 4.1.133 above apply to मातृष्वसृ also. As मातृष्वस्रीयः or मातृष्वसेयः 'the son of a mother's sister'.

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