7.3.29
तत्प्रत्ययस्य च
Operational rule vidhi
Even so from a new derivative from this stem ending in ढ, formed with a तद्धित affix having an indicatory ञ् , ण् or क् there is वृद्धि substitution for the first vowel of the second member and optionally for the first vowel of the first member in प्रवाहणेय and प्रावाहणेय.
Word by word (padaccheda)
Target तत्प्रत्ययस्य ṣaṣṭhī · ekavacanaIndeclinable 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".
Dotted words are technical terms, dashed ones pratyāhāras (names for classes of sounds or affixes). Hover or tap one to see its card.
Full reading
तत्प्रत्ययस्य च
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
Even so from a new derivative from this stem ending in ढ, formed with a तद्धित affix having an indicatory ञ् , ण् or क् there is वृद्धि substitution for the first vowel of the second member and optionally for the first vowel of the first member in प्रवाहणेय and प्रावाहणेय।
As प्रवाहणेयस्यापत्यं = प्रावाहणेयिः or प्रवाहणेयिः, प्रा or प्र-वाहणेयकम् ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.