4.4.102
कथादिभ्यष्ठक्
Operational rule vidhi
The affix ठक् comes in the sense of 'excellent with regard thereto' after the words कथ etc.
Word by word (padaccheda)
Left context कथा- आदिभ्यः pañcamī · bahuvacanaSubstitute / term prathamā · ekavacana
- 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.
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Full reading
कथा-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix ठक् comes in the sense of 'excellent with regard thereto' after the words कथ etc.
Thus कथायां साधुः = काथिकः (कथा + ठक् = कथ् + ठक् 6.4.148 = काथ् + इक् 7.2.116) 'a narrator of stories'. So वैकथिकः &c.
1 कथा, 2 विकथा, 3 विश्वकथा, 4 संकथा, 5 वितण्डा, 6 कुष्ठविद् (कुष्ट विद्, कुष्टचित्) 7 जनवाद, 8 जनेवाद, 9 जानोवाद (!) 10 वृत्ति, 11 संग्रह (सद्ग्रह), 12 गुण, 13 गण, 14 आयुर्वेद. ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.