8.2.43
संयोगादेरातो धातोर्यण्वतः
Operational rule vidhi
For the त of the निष्ठा there is substituted न after a root ending in आ and commencing with a conjunct consonant, if the latter contains a semi-vowel.
Word by word (padaccheda)
Left context संयोगादेः pañcamī · ekavacanaLeft context आतः pañcamī · ekavacanaLeft context धातोः pañcamī · ekavacanaLeft context यण्वतः pañcamī · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
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Full reading
संयोगादेः आतः धातोः यण्वतः
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
For the त of the निष्ठा there is substituted न after a root ending in आ and commencing with a conjunct consonant, if the latter contains a semi-vowel.
Thus from द्रा we have प्रद्राणः, प्रद्राणवान् ॥ ग्लानः, ग्लानवान् from ग्ला ॥ These roots द्रा and ग्ला end in आ, have a conjunct consonant in the beginning, one of which is a semi-vowel र and ल ॥
Why do we say "beginning with a double-consonant"? Observe यातः, यातवान् ॥
Why do we say "ending in आ"? Observe च्युतः, च्युतवान्; प्लुतः, प्लुतवान् ॥
Why do we say "after a root"? Observe निर्यातः, निर्वातः ॥ For the roots या and वा do not begin with a conjunct consonant, and that which is a conjunct i.e. र्या and र्वा is not a root, hence the rule does not apply.
Why do we say "having a यण् or semi-vowel"? Observe स्नातः, स्नातवान् ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.