जनिवध्योश्च

Operational rule vidhi

The वृद्धि is not substituted for the vowels of जन् 'to produce' and वधे before the Aorist sign चिण् and the कृत् affixes with an indicatory ञ् or ण् .

Word by word (padaccheda)

Target जनिवध्योः ṣaṣṭhī · dvivacanaIndeclinable च avyaya

Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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Full reading

जनिवध्योः च

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

Commentary

The वृद्धि is not substituted for the vowels of जन् 'to produce' and वधे before the Aorist sign चिण् and the कृत् affixes with an indicatory ञ् or ण् ।
As अजनि and अवधि with चिण्, and जनकः and वधकः (with ण्वुल्), प्रजनः, वधः ॥ This rule refers to the separate and the distinct root वध and not to the substitute of हन् ॥ This we see in the line भक्षकश्चेन्न विद्यते वधकोऽपि न विद्यते ॥ The form from हन् will be घातकः ॥ Moreover the substitute वध ends with अ i.e. it is of two syllables 'badha', and as such it also does not admit Vriddhi. (See 2.4.42). The prohibition refers to चिण् and krit-affixes, therefore not here, as जजान गर्भं महिमानमिन्द्रम् ॥

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