4.4.57
प्रहरणम्
Operational rule vidhi
The affix ठक् comes in the sense of 'this is whose weapon' after a word denoting 'a weapon' and being in the Nominative 1st-Case in construction.
Word by word (padaccheda)
Substitute / term प्रहरणम् prathamā · ekavacana
- 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
प्रहरणम्
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 'this is whose weapon' after a word denoting 'a weapon' and being in the Nominative 1st-Case in construction.
Thus असिः प्रहरणमस्य = आसिकः 'a swordsman'. So प्रासिकः, चाक्रिकः, धानुष्कः ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.